Shaded Hills fixes for August 20, 2024

[out-of-phaze]

Description of changes

Some fixes, edits, etc. The commit names are pretty descriptive. Some notes:

• Not all of the posture/AI changes are linked directly with existing issues, I found them while looking into the opossum stuff. would like a closer look at it, there were a few bugs in there that aren't on the tracker so i'm happy to explain
• I put the signpost info on mechanics info in the codex rather than on examine.

Why and what will this PR improve

Fixes https://github.com/PyrelightSS13/Pyrelight/issues/66 Fixes https://github.com/PyrelightSS13/Pyrelight/issues/64 Fixes mice always appearing to be resting after an icon update, unless they were non-deliberately prone. Fixes https://github.com/PyrelightSS13/Pyrelight/issues/75 Fixes https://github.com/PyrelightSS13/Pyrelight/issues/67 Fixes https://github.com/PyrelightSS13/Pyrelight/issues/65 Fixes https://github.com/PyrelightSS13/Pyrelight/issues/63 Fixes https://github.com/PyrelightSS13/Pyrelight/issues/62 Fixes #4384 Improves saycode quality by removing a parameter that was never set by anything ever. Also adds \The so you get The cow moos, "Moo." instead of cow moos, "Moo.". Fixes https://github.com/PyrelightSS13/Pyrelight/issues/72. Makes thread have less matter, so that it cleanly divides the matter amount in offal. Fixes https://github.com/PyrelightSS13/Pyrelight/issues/61

Authorship

Me. My girlfriend helped with the colors.