Task: remove older scanned metadata

For most framework bindings using only the latest SDK to compile metadata should be fine.

Remove all scanned metadata that has no effect on the output, keeping only the latest.

Likely for PyObjC 11:

Drop all scanned metadata for macOS 10.0 to 10.8, keeping only APIs present in the 10.9 SDK or later
Consider dropping all APIs not present in the latest SDK (disadvantage: breaks stuff for users of older systems)

The goal is to keep a minimal set of old metadata to make it easier to switch to newer tooling.

ronaldoussoren / pyobjc