stoq: Rename AppWindow to ShellApp

Change-Id: I546b19aee927e130d1d75f83d902717b6ece489d
VersionChecker: fix a typo

Change-Id: Ib2188ce0a8a177bb595efc6ae8bdbdd882926d84
shell: move shell windows to shell

Change-Id: I62a6553f7a6bfa99d7d36dadda9b75af1a7deadd