SM64 Always Gassy

Simple challenge hack that makes Mario always lose health to poisonous gas.
Lives are removed, collecting a 1-Up fully replenishes your health.
A Difficulty menu replaces the sound option menu, changing your difficulty affects how quickly Mario loses health.

v1.3.3 Changelog:
- Additional water tweaks

v1.3.2 Changelog:
- No longer deals additional gas damage whilst underwater, makes Board Bowser's Sub more reasonable.

v1.3.1 Changelog:
- Adjusted difficulty multipliers

v1.2 Changelog:
- Added a difficulty menu in place of the sound options on the file select. The difficulty affects the rate Mario loses health.

v1.1 Changelog:
- No longer gassy outside of actual courses. You don't take damage in the lobbies, courtyard, Castle Grounds, etc.