Underground City Engineering

I just released the mod.

Add mining machine, mining pipeline, core block, circuit block, mechanical block and mechanical shell.

Add zh_ cn.lang (Chinese language file), EN_ us.lang (English language document).

Chinese language file "mining pipeline" rewrites "mining pipeline".

English language file "mining tube" rewrites "mining pipe".

Mining pipeline ID "mining"_ "Tube" rewrites "mining"_ pipe”.