[LMP] Clear queue on setting new source.
[TSM] Updated CMakeLists.txt.

Don't double-install translations and removed pre-automoc stuff.
[Core] Respect "SessionData/RootWindowIndex" tab property.

Allows tabs to choose which window they want to go into or create new
windows.
[TSM] Set "SessionData/RootWindowIndex" on recover.

Effectively recovers the multiwindow structure.