Improvments to gstreamer backend and settings +++

- Fixed bug not setting environment for gstreamer before initialization
- Fixed windows directsound device
- Fixed crash on failure to create gstreamer element
- Fixed crash when switching backend
- Don't stop playback if equalizer or replay gain fails in gstreamer
- Improvments to backend settings
- Fixed backend settings to work for windows
- Fixed replay gain settings not working
- Fixed right click menu for album showing in statusview even when no song was playing
- Removed redundant code

src/engine/directsounddevicefinder.cpp

@@ -44,15 +44,13 @@ BOOL DirectSoundDeviceFinder::EnumerateCallback(LPGUID guid, LPCSTR description,
 
   State *state = reinterpret_cast<State*>(state_voidptr);
 
-  if (guid) {
-    Device dev;
-    dev.description = QString::fromUtf8(description);
-    dev.device_property_value = QUuid(*guid).toByteArray();
-    dev.iconname = GuessIconName(dev.string, dev.description);
-    state->devices.append(dev);
-  }
+  Device dev;
+  dev.description = QString::fromUtf8(description);
+  if (guid) dev.value = QUuid(*guid).toByteArray();
+  else dev.value = QVariant();
+  dev.iconname = GuessIconName(dev.description);
+  state->devices.append(dev);
 
   return 1;
 
 }
-