stm: LCD support for PYBv4; fix MMA reading code.
Merge branch 'master' of github.com:micropython/micropython
py: Simpler implementation of mp_obj_callable.
py: Implement bool unary op; tidy up unary op dispatch.
Merge branch 'master' of github.com:iabdalkader/micropython into iabdalkader-master

Conflicts:
	stm/main.c
Move LED defs to mpconfigport.h