Fix timeout flarm disconnection detection, 30 seconds fixed after last reception of a flarm data
	modified:   Parser.cpp
Do not reset vario available and other sensors if one of the port in LK is disabled.
	modified:   Comm/UpdateMonitor.cpp
Detect FLARM missing from UpdateMonitor, and not from Parser.
Otherwise it would work only when using a multiplexer still sending nmea sentences.
	modified:   ../Header/Globals.h
	modified:   Comm/LKFlarm.cpp
	modified:   Comm/Parser.cpp
	modified:   Comm/UpdateMonitor.cpp
	modified:   Globals.cpp
	modified:   LKSimTraffic.cpp
Ensure we are not resetting global flags for a device gone silent more than one time.
	modified:   UpdateMonitor.cpp
Fix text keyboard not resetting content on startup. We show old content, before deleting it upon any key activity, except DEL.
With DEL , we only cancel last character keeping the old content.
	modified:   Dialogs/dlgTextEntry_Keyboard.cpp