Use PCI for immediate response on pins watched

Use the Pin Change Interrupts to wake up uC when a watched pin changes the state during sleep mode. If using PCI, don't switch off the pullup resistors.
Merge branch 'patch-1' of https://github.com/Inhumierer/smarthomatic into Inhumierer-patch-1
Merge branch 'Inhumierer-patch-1' into develop
Distinguish wake-up by pin change and RFM12B wake-up to ensure usual measuring interval for other sensors on pin change.
Use sbi macro as everywhere.
Wait for stable voltage level only if pull-ups were switched on now.