Some refactoring
Remove circuit nodes duplicates from games/minimal/mods/default/init.lua
Remove circuit elements textures duplicates from games/minimal/mods/default/textures/
Initial support of 6d facedir + some refactoring.
Bug fixes + Some refactoring.
Add license headers
Add more circuit elements
ABM fix
fix warning
Use more threads for making mesh
Fix flicker
Small fixes for android build (WIP)
Dont owerflow mesh make queue
Better drawlist
Revert "Fix windows build"

This reverts commit 93aa08b7557543074a547c4ec113460964947b53.
Fix VS build.
Better urgent priority
Fix client shutdown
Fix thread restart
more server threads to thread_pool