gui/components: CSignalBox: allow for horizontal arrangement; add methods to retrieve current value

Signed-off-by: Thilo Graf <dbt@novatux.de>
gui/motorcontrol, gui/scan: switch to CSignalBox

Signed-off-by: Thilo Graf <dbt@novatux.de>

Conflicts:
	src/gui/scan.cpp
gui/streaminfo2.h: don't include cc.h twice

Signed-off-by: Thilo Graf <dbt@novatux.de>

Conflicts:
	src/gui/streaminfo2.h
CComponents: fix compiler warnings with DEBUG_CC
Merge remote-tracking branch 'cool-next-cc/next-cc'

Conflicts:
	src/gui/scan.cpp