Add method to set counter value

Signed-off-by: Michael Buesch <m@bues.ch>
WordPacker: Use unpack_from

Signed-off-by: Michael Buesch <m@bues.ch>
Extend time formating

Signed-off-by: Michael Buesch <m@bues.ch>
Timers: Add method to get and set BCD values

Signed-off-by: Michael Buesch <m@bues.ch>
MemArea: Implement Z and T

Signed-off-by: Michael Buesch <m@bues.ch>
gui: Add T and Z windows

Signed-off-by: Michael Buesch <m@bues.ch>