This avoids an issue where the skins array takes up a fixed, but large
amount of memory at runtime. On x86_64 linux, that array is roughly 80
megabytes in memory, most of which is unused when the game is unmodded.
Instead, we treat `skins` as a dynamically resizing array, and it is an
array-of-pointers into separate allocated `skin_t`.
This is based on Lactozilla's skin limit MR for SRB2, but I've rewritten
it because RR has diverged quite a bit.
This was verified to check every access of `skins` by using clangd's
find-all-references function. However, I have only tested plain skins,
not Lua addons, so that could afford some extra checking.
Before I was using coefficents from another formula I forget the source of, but over time I've stopped liking how it looked -- just considers greens far too bright. Here I'm trying out BT.601 coefficents instead (https://en.wikipedia.org/wiki/Rec._601).
These are also the coefficients Doom itself used for invulnerability's invert effect (if you ignore the typo Carmack made :p), so this checks out.
- Invert high contrast greyscale colorization effect for damage hitlag
- Jitter is now also exclusive to damage-related hitlag
- Since jitter is now just tied to a flag, removed the old trick momentum hack
Instead of doing its best to avoid P_DamageMobj, it embraces it, using the damagetype system to decide how the player takes damage. Overall less stupid.
