Add UI theme support.

- Add dark theme (Night Mapping)
- Themes loaded from resources\themes and ~\.qgis2\themes
- Themes need folder + style.qss

Author: NathanW2

python/core/qgsapplication.sip

@@ -189,6 +189,12 @@ static void qtgui_UpdatePyArgv(PyObject *argvlist, int argc, char **argv)
     //! default theme if the active theme does not have the required icon.
     static QPixmap getThemePixmap( const QString &theName );
 
+    static const QHash<QString, QString> uiThemes();
+
+    static void setUITheme( const QString &themeName );
+
+    static const QString uiThemeName();
+
     //! Returns the path to user's style.
     static const QString userStyleV2Path();
 

resources/CMakeLists.txt

@@ -1,6 +1,7 @@
 INSTALL(FILES srs.db qgis.db symbology-ng-style.db spatialite.db customization.xml
         DESTINATION ${QGIS_DATA_DIR}/resources)
 INSTALL(DIRECTORY cpt-city-qgis-min DESTINATION ${QGIS_DATA_DIR}/resources)
+INSTALL(DIRECTORY themes DESTINATION ${QGIS_DATA_DIR}/resources)
 
 ADD_SUBDIRECTORY(context_help)
 ADD_SUBDIRECTORY(function_help)