Remove vanilla stuff

[PFQNiet]

A lot of stuff in vanilla Factorio won't be here. They need to be removed.

• [x] Inserters (replaced with built-in loaders on buildings)
• [x] Default assembly machines
• [x] Default furnaces
• [x] Lab / science packs / research in general (although this could be repurposed for the M.A.M.)
• [x] Default guns
• [x] Oil refinery, chem plant, rocket silo, etc.
• [x] Do actual removal of all unused entites!