[*] StbMainApp: Move dvb signal monitoring from F1 into Settings menu

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] StbMainApp: Add information message on changing analog audio demod mode

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] StbMainApp: Disable sorting channels in main playlist

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