[*] StbMainApp: Add changes from garb branch into mainstream.

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] StbMainApp: Always present channels list menu on stb850, because of analog tuner.

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] StbMainApp: Check video inputs once.

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>