* implemented a touch disable/enable statemachine
works as follows:
if touch is enabled, everything is processed
if touch is disabled, nothing is processed
when switching from disabled to enabled, and the display touched before, the TE_UP/TE_SLIDE_END ist ignored
when switching from enabled to disabled and the display is touched, the next TE_UP/TW_SLIDE_END will be processed, to leave nobody in a touch started but never ended state
* fix touch screen handling when staring touch while disabled and releasing touch when enabled
* touch on/off with backlight on/off is working
* setTouchEnable has to be #if defed for touch radios
