Allow for entity rendering overrides using the resourcepack

[Joeywp]

As mentioned in several other issues such as #2088 and my own #1214, 3d models attached to entities become invisible when look at from specific angles/locations. As a work around, it could be useful if entities could be forced to render, as discussed on Discord.

A proposal for this could be something the likes of:

File assets/minecraft/optifine/entity.properties
============
alwaysRender=armor_stand[head] arrow player[head,offhand,mainhand]

Basically it's a space-separated array, where either an entity can be forced to always be overriden (armor_stand), or only when it's wearing items in specific slots, like the helmet (armor_stand[head]) or a collection of slots (armor_stand[head,offhand]).

I'm not sure if there is already a "standard" for slotnames, but if not, these could be (following the internal names for these slots as found in Spigots EnumItemSlot):

• head
• chest
• legs
• feet
• mainhand
• offhand

This workaround would have the possibility to at least partially fix this problem

[78wesley]

This would be great !

[JanUmbach]

Any updates on this? :)