[System][Stingray] widget visibility follows homescreen visibility
Merge pull request #49 from rexboy7/tv-arch1-system-visibilitymanage

[System][Stingray] widget visibility follows homescreen visibility
[System][Stingray] Also do setVisibile() for showall/hideall requests
Merge pull request #50 from rexboy7/tv-arch1-system-showallhideall

[System][Stingray] Also do setVisibile() for showall/hideall requests
WIP issue #43