Add RenderArmEvent

[RuiXuqi]

Backport of MinecraftForge/MinecraftForge#8254

[kappa-maintainer]

Looks good

[kappa-maintainer]

Nvm, fix your patches first

[RuiXuqi]

Nvm, fix your patches first

Should be OK now.

[Rongmario]

Looks good, I would also like the ModelPlayer from RenderPlayer#getMainModel() instance passed through to the event.

[RuiXuqi]

Looks good, I would also like the ModelPlayer from RenderPlayer#getMainModel() instance passed through to the event.

Can we just pass RenderPlayer instance through this since other methods like RenderPlayer#setModelVisibilities() may be called with AT?

[Rongmario]

Should we make setModelVisibilities public?

[RuiXuqi]

Should we make setModelVisibilities public?

Let mods do this since AT is easy to use

[Rongmario]

Looks good, I would also like the ModelPlayer from RenderPlayer#getMainModel() instance passed through to the event.

Can we just pass RenderPlayer instance through this since other methods like RenderPlayer#setModelVisibilities() may be called with AT?

Go ahead with this then ^^

[RuiXuqi]

Looks good, I would also like the ModelPlayer from RenderPlayer#getMainModel() instance passed through to the event.

Can we just pass RenderPlayer instance through this since other methods like RenderPlayer#setModelVisibilities() may be called with AT?

Go ahead with this then ^^

Done