organize qml files in subdirectories

This makes the organization of the qml files a bit more fine-grained, it
prevents mixing of .cpp and QML files, and also of what's compiled, and
what's included in the app as qrc data.

In particular:
- subsurface specific QML items go into the qml/ subdirectory
- theme and unit definitions to into qml/theme subdirectory (they
  already were located in a theme directory)
- generic components, such as our Label goes into qml/components

This facilitates sharing of functionality and identifying common stuff
better. Ideally, we can pull qml/theme and qml/components from a
standardized set at some point, so we don't have to maintain that code.

Signed-off-by: Sebastian Kügler <sebas@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-mobile/qml/mobile-resources.qrc

@@ -9,8 +9,8 @@
         <file>Log.qml</file>
         <file>TopBar.qml</file>
         <file>ThemeTest.qml</file>
-        <file>Label.qml</file>
-        <file alias="subsurface-mobile-icon.png">../icons/subsurface-mobile-icon.png</file>
+        <file alias="Label.qml">components/Label.qml</file>
+        <file alias="subsurface-mobile-icon.png">../../icons/subsurface-mobile-icon.png</file>
     </qresource>
     <qresource prefix="/qml/theme">
         <file alias="Theme.qml">theme/Theme.qml</file>