[suggestion] Import / Export rules

[jason1996]

*Sorry for my bad English*

So I was playing prison architect for a few hours, and messing around with workshops trying to make them run properly because somehow logs were getting exported before the processed wood (I am playing in v2preview, so it might just be a bug) but then realized that one feature misses that could potentially complicate the game but in a good way.

Import / Export rules.

Import:
- Deny metal plates import.
- Import logs for processing (for a cost naturally).
- Set priorities in what should get imported first (ex: trees before furniture/materials)
- …

Export:
- Deny/ Allow certain materials to get exported
- Set a percentage on certain exports (ex: logs 25%; wood: 50%; superior beds: 100%)
- ...

This system is expandable and could even be implemented with mods with their own import / exports materials