assembly overhaul

[Game Hunter]

All are possibilities on the table:

• Removing OP/bad assemblies
• Changing recipes/schematics of existing assemblies
• Changing stats of existing assemblies

Mostly we need to transition from the state of having too many assemblies require exotic/unique mods, specifically Nano Pack. Overall:

• Basic assemblies can be basically anything, since they don't need WK
• Adv assemblies should mostly be common-only, a few "nice" ones with exotic/unique
• Master assemblies should all require either an exotic/unique mod or an exotic base equipment (or both!)

Also consider removing or changing the extra-mod possibility on assemblies, as it makes balancing them very difficult.