### Chores
- Switched to [libretro-deps](https://github.com/libretro/libretro-deps) for freetype and zlib
- Clean up of image and audio memory allocation
- Updated documentation

### Features
- `love.system.execute()` to execute a operating system shell command
- `love.audio.newSource()` now has an optional `type` parameter
- `love.joystick` comes with a cleaner API
- `exit()` callback, which is called when is quitting the game
- `love.filesystem` now mounts `libretro/assets`, `libretro/system` and `libretro/saves`