Pyboy

* **Release the GIL for most of `pyboy.tick`**
* Remove warning about emulation speed when using dummy/headless window
* Large internal improvements

* Fix graphics glitch with sprite priority

* Improve performance
* Fix controls not being printed
* Updated color palette for DMG games running in CGB mode

* Drastically improve rendering performance (headless, SDL2, OpenGL)

* Performance improvement to `Screen.screen_ndarray()`
* Pokemon game wrapper now has a `.game_area_collision()` to get walkable areas
* Option to set the color palette for DMG games in CGB-mode

* Fix Makefile requiring zsh
* Fix crash when failing to initialize sound (especially on WSL)
* Fix Kirby game wrapper scoring and game over conditions