Lawu 3.0 and refactoring

[nickelpro]

This PR is a staging area primarily for updating Burger to Lawu 3.0, but also general refactoring work to take advantage of the fact I have to touch the entire codebase anyway.

General goals:

• Excise Python2 and six
• Use Python 3 idioms where it makes sense (f-strings)
• Generally cleanup of Burger's 10-year old codebase

Status:

• munch.py
• identify.py
• version.py
• biomes.py
• blocks.py
• blockstates.py
• entities.py (In progress)
• entitymetadata.py
• items.py
• language.py
• objects.py
• packetinstructions.py
• packets.py
• particletypes.py
• recipes.py
• sounds.py
• stats.py
• tags.py
• tileentities.py

Lawu

Lawu is still in-development, as such this PR relies on my personal branch of Lawu. The PR for this branch can be followed here: TkTech/lawu#28