The below memory leaks were caused by failing to release reference
counted resources. I confirmed using instruments that my changes stopped
the leaks from occurring.

- System prompts 
- Screen capturing 
- loading font families

There were also two memory leaks I found from some of our dependencies
that I made PRs to fix
- https://github.com/RustAudio/coreaudio-rs/pull/147
- https://github.com/servo/core-foundation-rs/pull/746

Release Notes:

- N/A