Upgraded Qwt to 6.2 (branch: qwt-multiaxes) (#4427)

This commit is based on https://github.com/GoldenCheetah/GoldenCheetah/pull/3956
with the following additions / changes:
* Upgraded to the latest version of the multiaxes-branch, thus eliminating crashes of GoldenCheetah on startup
* Disabled the emitting of Layout Requests on geometry changes of QwtScaleWidget - without this, CPU utilization was up to 100% on one core
* Added the class SplineLookup, reusing small portions of code from Qwt 6.1
* Re-added the splines in WPrime and RideFile (resampling), using the new interface of QwtSpline
* Appveyor: qwt in cache-section now depends on qwt/qwtconfig.prin.in for refresh on version change

qwt/qwtconfig.pri.in

@@ -8,8 +8,8 @@
 ################################################################
 
 QWT_VER_MAJ      = 6
-QWT_VER_MIN      = 1
-QWT_VER_PAT      = 1
+QWT_VER_MIN      = 4
+QWT_VER_PAT      = 0
 QWT_VERSION      = $${QWT_VER_MAJ}.$${QWT_VER_MIN}.$${QWT_VER_PAT}
 
 ######################################################################
@@ -19,11 +19,13 @@ QWT_VERSION      = $${QWT_VER_MAJ}.$${QWT_VER_MIN}.$${QWT_VER_PAT}
 QWT_INSTALL_PREFIX = $$[QT_INSTALL_PREFIX]
 
 unix {
-    QWT_INSTALL_PREFIX    = /usr/local/qwt-$$QWT_VERSION-svn
+    QWT_INSTALL_PREFIX    = /usr/local/qwt-$$QWT_VERSION-ma
+    # QWT_INSTALL_PREFIX = /usr/local/qwt-$$QWT_VERSION-ma-qt-$$QT_VERSION
 }
 
 win32 {
-    QWT_INSTALL_PREFIX    = C:/Qwt-$$QWT_VERSION-svn
+    QWT_INSTALL_PREFIX    = C:/Qwt-$$QWT_VERSION-dev
+    # QWT_INSTALL_PREFIX = C:/Qwt-$$QWT_VERSION-dev-qt-$$QT_VERSION
 }
 
 QWT_INSTALL_DOCS      = $${QWT_INSTALL_PREFIX}/doc
@@ -33,10 +35,10 @@ QWT_INSTALL_LIBS      = $${QWT_INSTALL_PREFIX}/lib
 ######################################################################
 # Designer plugin
 # creator/designer load designer plugins from certain default
-# directories ( f.e the path below QT_INSTALL_PREFIX ) and the 
+# directories ( f.e the path below QT_INSTALL_PREFIX ) and the
 # directories listed in the QT_PLUGIN_PATH environment variable.
 # When using the path below QWT_INSTALL_PREFIX you need to
-# add $${QWT_INSTALL_PREFIX}/plugins to QT_PLUGIN_PATH in the 
+# add $${QWT_INSTALL_PREFIX}/plugins to QT_PLUGIN_PATH in the
 # runtime environment of designer/creator.
 ######################################################################
 
@@ -53,12 +55,12 @@ QWT_INSTALL_PLUGINS   = $${QWT_INSTALL_PREFIX}/plugins/designer
 # Features
 # When building a Qwt application with qmake you might want to load
 # the compiler/linker flags, that are required to build a Qwt application
-# from qwt.prf. Therefore all you need to do is to add "CONFIG += qwt" 
+# from qwt.prf. Therefore all you need to do is to add "CONFIG += qwt"
 # to your project file and take care, that qwt.prf can be found by qmake.
 # ( see http://doc.trolltech.com/4.7/qmake-advanced-usage.html#adding-new-configuration-features )
 # I recommend not to install the Qwt features together with the
 # Qt features, because you will have to reinstall the Qwt features,
-# with every Qt upgrade. 
+# with every Qt upgrade.
 ######################################################################
 
 QWT_INSTALL_FEATURES  = $${QWT_INSTALL_PREFIX}/features
@@ -73,15 +75,22 @@ QWT_INSTALL_FEATURES  = $${QWT_INSTALL_PREFIX}/features
 #QWT_CONFIG           += QwtDll
 
 ######################################################################
-# QwtPlot enables all classes, that are needed to use the QwtPlot 
+# QwtPlot enables all classes, that are needed to use the QwtPlot
 # widget. 
 ######################################################################
 
 QWT_CONFIG       += QwtPlot
 
+######################################################################
+# QwtPPolar enables all classes, that are needed to use the QwtPolar
+# classes. It can't be enabled without also enabling QwtPlot
+######################################################################
+
+QWT_CONFIG       += QwtPolar
+
 ######################################################################
 # QwtWidgets enables all classes, that are needed to use the all other
-# widgets (sliders, dials, ...), beside QwtPlot. 
+# widgets (sliders, dials, ...), beside QwtPlot.
 ######################################################################
 
 QWT_CONFIG     += QwtWidgets
@@ -100,18 +109,7 @@ QWT_CONFIG     += QwtSvg
 QWT_CONFIG     += QwtOpenGL
 
 ######################################################################
-# You can use the MathML renderer of the Qt solutions package to 
-# enable MathML support in Qwt. Because of license implications
-# the ( modified ) code of the MML Widget solution is included and
-# linked together with the QwtMathMLTextEngine into an own library. 
-# To use it you will have to add "CONFIG += qwtmathml"
-# to your qmake project file.
-######################################################################
-
-QWT_CONFIG     += QwtMathML
-
-######################################################################
-# If you want to build the Qwt designer plugin, 
+# If you want to build the Qwt designer plugin,
 # enable the line below.
 # Otherwise you have to build it from the designer directory.
 ######################################################################
@@ -123,7 +121,7 @@ QWT_CONFIG     += QwtDesigner
 # of linking it against the shared Qwt library. Has no effect
 # when QwtDesigner or QwtDll are not both enabled.
 #
-# On systems where rpath is supported ( all Unixoids ) the 
+# On systems where rpath is supported ( all Unixoids ) the
 # location of the installed Qwt library is compiled into the plugin,
 # but on Windows it might be easier to have a self contained
 # plugin to avoid any hassle with configuring the runtime
@@ -142,10 +140,10 @@ win32 {
 QWT_CONFIG     += QwtExamples
 
 ######################################################################
-# The playground is primarily intended for the Qwt development 
+# The playground is primarily intended for the Qwt development
 # to explore and test new features. Nevertheless you might find
 # ideas or code snippets that help for application development
-# If you want to auto build the applications in playground, enable 
+# If you want to auto build the applications in playground, enable
 # the line below.
 # Otherwise you have to build them from the playground directory.
 ######################################################################
@@ -153,11 +151,28 @@ QWT_CONFIG     += QwtExamples
 QWT_CONFIG     += QwtPlayground
 
 ######################################################################
-# When Qt has been built as framework qmake wants 
+# If you want to auto build the tests, enable the line below
+# Otherwise you have to build them from the tests directory.
+######################################################################
+
+QWT_CONFIG     += QwtTests
+
+######################################################################
+# When Qt has been built as framework qmake wants
 # to link frameworks instead of regular libs
 ######################################################################
 
 macx:!static:CONFIG(qt_framework, qt_framework|qt_no_framework) {
 
     #QWT_CONFIG += QwtFramework
-}  
+}
+
+######################################################################
+# Create and install pc files for pkg-config
+# See http://www.freedesktop.org/wiki/Software/pkg-config/
+######################################################################
+
+unix {
+
+    QWT_CONFIG     += QwtPkgConfig
+}