split Device class to allow keeping download state

right now there's just one object for each Device type througout the whole
app. This forbids keeping actual state in the Device object during
download/cleanup.

This patch puts the list of supported Devices into a seperate class.
Actual Device objects are now created dynamically.

This is necessary for the upcoming Download changes.

src/Device.cpp

@@ -18,7 +18,9 @@
 
 #include "Device.h"
 
-typedef QMap<QString,Device*> DevicesMap;
+#define tr(s) QObject::tr(s)
+
+typedef QMap<QString,DevicesPtr> DevicesMap;
 
 static DevicesMap *devicesPtr;
 
@@ -26,28 +28,34 @@ inline DevicesMap &
 devices()
 {
     if (devicesPtr == NULL)
-        devicesPtr = new QMap<QString,Device*>;
+        devicesPtr = new QMap<QString,DevicesPtr>;
     return *devicesPtr;
 }
 
+Device::~Device()
+{
+    if( dev->isOpen() )
+        dev->close();
+}
+
 QList<QString>
-Device::deviceTypes()
+Devices::typeNames()
 {
     return devices().keys();
 }
 
-Device &
-Device::device(const QString &deviceType)
+DevicesPtr
+Devices::getType(const QString &deviceTypeName )
 {
-    assert(devices().contains(deviceType));
-    return *devices().value(deviceType);
+    assert(devices().contains(deviceTypeName));
+    return devices().value(deviceTypeName);
 }
 
 bool
-Device::addDevice(const QString &deviceType, Device *device)
+Devices::addType(const QString &deviceTypeName, DevicesPtr p )
 {
-    assert(!devices().contains(deviceType));
-    devices().insert(deviceType, device);
+    assert(!devices().contains(deviceTypeName));
+    devices().insert(deviceTypeName, p);
     return true;
 }