More Silk Products, 2: Decorations and a Freaking Window

[crekulon]

This adds some more silk building options for arachnids, mostly intended to make it easier to adopt an existing space and twist it into a webbed lair. They're all intended to be cosmetic enhancements and are easily removed even by punching.

• "Window-weaves" are functionally kind of similar to grilles in that they occupy a space and let air through, but can't have windows placed over them or be electrified. They mostly exist to fill the space of "a wall you can see through." They are extremely delicate and break in a single punch.
• The new ability to make the two variations of the formerly entspawn-only "cobweb" also lets you put little web decorations over existing furniture, making anything fit in with a web theme.
  • These cobwebs have also been adjusted to be easier to remove.
• New "web wall decor" can be placed on walls, and helps make any space fit web tiles without needing to tear down tons of walls.

Changelog

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• add: New web structures. Arachnids can build small decorative cobwebs, poster-like web decals to make walls look a little spidery, and grille-like "window-weaves" to let some light in.
• tweak: Decorative corner cobwebs now use the web damage modifier and have much less HP (why did they have almost as much as a web wall)