Presets

I never got `getPresets` working, and `setPresets` needs some testing. This would help linux people a lot, since there is no way for them to work with presets.

In addition to `getPresets` working at all, I need to test both to make sure they basically work, as this is an area I did not do enough experimentation with.

No files or test paths are named. Start by locating the getPresets and setPresets entry points, then reproduce the Linux preset behavior and inspect how existing preset operations are exercised. Done means getPresets works and both operations have tests covering their basic behavior.

Written by the indexing model from the issue text.