More PyObjC work

Worked on PyObjC a bit during the day, in particular on manual bindings for a couple of more complex APIs that cannot be described in PyObjC’s metadata system.

The framework bindings now pass on macOS 10.14, except for 3 newly wrapped frameworks that require some more manual bindings.

I should be on track to finish PyObjC 5.0 before macOS 10.14 reaches GM.

Ronald Oussoren @ronaldoussoren