Git: Revive ChangeSelectionDialog UI file

Much easier to maintain, real logic is more readable

Change-Id: I7c5f7854ea9ee67a3e1eb7a328702fc19852fdb5
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Petar Perisin <petar.perisin@gmail.com>