Added requestfiletree and requestfile functionality in ui
added folder navigation to requestfiletree
it is now possible to browse to all locations
Don't crash on cancel in file dialog.
Don't crash if sending without selecting a file.
Exit gracefully
Merge branch 'qt'
Revert passing stuff by reference in AppLayer
Conflicts:
	AppLayer.cpp
	AppLayer.h
	dtmfmagix.cpp
	main.cpp