Minor request: make rigid plastic sheet able to replace sheet of glass in most building and camp projects.

### Is your feature request related to a problem? Please describe.

Playing the innawood challenge, glass requires a lot of work to make in large quantities slowing down progress significantly, now that I have a cow, plastic is easier.

### Solution you would like.

For a lot of building projects, particularly the skylight, the plastic sheet should work fine as a replacement. Same with the camp building menu, have the recipes use rigid plastic sheets as an alternative.

### Describe alternatives you have considered.

Make it easier to produce glass, particularly a way that don't require ammonia, or if that is not possible, a way to produce ammonia more easily than requiring metal scrap as its hard to come by in innawood.

Or use embrasures in place of glass windows.

### Additional context

Right now I have two glass sheets that I use for the camp build menu, then when the building finish, I remove them and replace them with the plastic sheets or the embrasures.

Start by locating the skylight and camp building menu recipes, then inspect how glass sheets are specified as construction materials. Check whether rigid plastic sheets can be added as alternatives without affecting other building projects. Done means the requested building and camp recipes accept rigid plastic sheets and the relevant game behavior is covered by existing tests or verified in-game.

Written by the indexing model from the issue text.