feat: item & maps in frame rendering

[Phoenix616]

This is my WIP of rendering of item frames and especially maps in them. Opening this as a draft PR just to show my current state as a I wont be able to work on this for the next two weeks due to the holidays.

What works:

• Map rendering (but not updating or markers)
• Item Frame model

What doesn't work:

• Item Frame textures, these are loaded from block textures and I'm unsure how to properly access the block texture atlas in an entity model
• Positioning of the Item Frame entity is weird. This seems to be because Mineflayer only uses absolute numbers for the positions but item frames expect floats for their position as far as I can tell. This leads to the frames being inside block/hovering above them
• Markers on maps

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[zardoy]

Wow, I'm kind of impressed. Very cool, seems you understand the code base very well :)

Will make sure to answer your questions in a few days

[zardoy]

will texture be removed when the map entity is removed? from the current code it doesn't seem so, would be great if you could test:

• in console type: viewer.renderer.info.memory.textures - this number should not increase after removing / re-adding, thanks