workshop 2 palettization

[PatrikLundell]

Summary

None

Purpose of change

Palettize workshop expansion verison 2 to reduce the size of the JSON footprint.

Describe the solution

Essentially copy-paste-modify the same pattern as has been used for other expansions, i.e. make use of palette parameters instead of separate recipes for different construction materials.

Describe alternatives you've considered

Don't fix what ain't broken.

Testing

Constructed the buildings out of each material in a separate expansion slot (restarting each time as the base save uses basecamp version 1, which is bed restricted) and verifying that it looks as expected.
The first one also had all the interiors built (those recipes were not touched), but as the game crashed when trying to build a salt water pipe (#66318) I didn't get a chance to walk over and inspect the results, and couldn't be bothered to redo it as those recipes were unchanged and I didn't see anything off from what could be seen from the bulletin board.

Additional context

Added flag to accept items under the constructions and cleaned up palette names (2_2 -> 2).