test build 3354

Noggit changes

• Add noggit script brushes to mainline noggit release
  • See the documentation to learn how to write them
• Fix issue with F8 menu in test build 3085

Script changes

• Fix scripting on linux
• Change iterators to be lua tables (read below)
• Move tex_iterator::paint_image to procedures::paint_texture

For scripters: This versions breaks some important script functions relating to iteration (verts, chunks, models, tex units). See migration guide for how to update old scripts, or ask for help in the noggit discord. IHM#2145 is the developer in charge of script brushes.