Fix conflict with Qwtplot3d

The struct Appearance conflicts with a class
in the QWT3D namespace. So renamed it. Fixes
a compile time error.

src/Colors.cpp

@@ -109,7 +109,7 @@ void GCColor::setupColors()
 }
 
 // default settings for fonts etc
-struct Appearance defaultAppearance[] ={
+struct SizeSettings defaultAppearance[] ={
 
     // small screens include netbooks and old vga 800x600, 1024x768
     { 1024, 768,  8,8,8,8,8,8,    800, 600 },
@@ -126,7 +126,7 @@ struct Appearance defaultAppearance[] ={
     { 0,0,0,0,0,0,0,0,0,0 },
 };
 
-struct Appearance
+struct SizeSettings
 GCColor::defaultSizes(int width, int height)
 {
     for (int i=0; defaultAppearance[i].maxheight; i++) {

src/Colors.h

@@ -27,7 +27,7 @@
 class MainWindow;
 
 // set appearace defaults based upon screen size
-struct Appearance {
+struct SizeSettings {
 
     // this applies up to the following geometry
     int maxheight,
@@ -46,7 +46,7 @@ struct Appearance {
         height;
 };
 
-extern Appearance defaultAppearance[];
+extern SizeSettings defaultAppearance[];
 struct Colors
 {
         QString name,
@@ -67,7 +67,7 @@ class GCColor : public QObject
         static const Colors *defaultColorSet();
         static void resetColors();
         static QColor invert(QColor);
-        static struct Appearance defaultSizes(int width, int height);
+        static struct SizeSettings defaultSizes(int width, int height);
 
     public slots:
         void readConfig();

src/MainWindow.cpp

@@ -170,7 +170,7 @@ MainWindow::MainWindow(const QDir &home) :
         // first run -- lets set some sensible defaults...
         // lets put it in the middle of screen 1
         QRect size = desktop->availableGeometry();
-        struct Appearance app = GCColor::defaultSizes(size.height(), size.width());
+        struct SizeSettings app = GCColor::defaultSizes(size.height(), size.width());
 
         // center on the available screen (minus toolbar/sidebar)
         move((size.width()-size.x())/2 - app.width/2,