Added dockable settings and a toolbar
Make Undo/Redo available in the Edit menu, add correct shortcut on Mac
cosmetics: Display filename without full path
Removed redundant connections
Handle document filename, link document title to filename, handle document dirty state on open/new/quit
Initial support for Copy&Paste
#2 Cleaned up some compiler warnings
Merge remote-tracking branch 'origin/master' into gui-cleanup
Merge remote-tracking branch 'origin/master' into gui-cleanup
Merge remote-tracking branch 'origin/master' into gui-cleanup