Git: refactoring ChangeSelectionDialog

> Dialog now combines show, cherry-pick and revert
> has fixed path, and no way to change it
> not created on stack

Change-Id: I7cee0b2e775a80941b51a4ca023064baf0d6575c
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Petar Perisin <petar.perisin@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/git.qbs

@@ -28,7 +28,6 @@ QtcPlugin {
         "branchmodel.h",
         "changeselectiondialog.cpp",
         "changeselectiondialog.h",
-        "changeselectiondialog.ui",
         "clonewizard.cpp",
         "clonewizard.h",
         "clonewizardpage.cpp",