First-person Model

Fixes:

- Reworked helmet hiding, should now work with all armor mods!

- Hide own hitbox in f3+b while in first person

- Reworked shadow offset logic to fix issues with shaders

- Reworked offset logic to prevent issues with other mods

- A broken config file will now not crash the client

- (Fabric) Added issues URL (Thanks Domi)

- Hide elytra while swimming (Thanks Domi)

- Hide chest plate while swimming (Thanks Domi)

Added:

- Option to hide arrows stuck in the player (Thanks Domi)