resourceeditor: Make qrc-files' context menu more consistent

Change-Id: I97e5354bc892194d34ba968b0428bbc3bfdcd11d
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Android: Handle offline state

Task-number: QTCREATORBUG-11056
Change-Id: I81b58d08b66b4fb8322e5c6c4935ddfb9470318f
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>