FIXED: compilers warnings in _CPObjectAnimator
Added CPAnimatablePropertyContainer protocol
New: Jake command for building a Docset

This commit adds the `docset` command to jake, to create a Docset from a doxygen build. It adds a shell script to the "support" directory that manages the build, and includes an Info.plist file that gets copied to the Docset when built.
Merge remote-tracking branch 'personal/fix-doxygen-config' into rodan-custom-build
Merge branch 'refs/heads/pr/2278' into rodan-custom-build