cherry-pick: Virtueller Timer für Entprellung implementiert

Conflicts:
	Project/ARMCM4-STM32F407-DISCOVERY/keil/ch.uvopt
	Project/ARMCM4-STM32F407-DISCOVERY/keil/ch_Demo.dep
	Project/ARMCM4-STM32F407-DISCOVERY/keil/lst/ch.map