Shining spring rejig

[ruddygreat]

wanted to differentiate using the shining spring from just throwing a cleanade a little more, so now it does this!

ngl not entirely happy with the GunSystem change but it's the only good way to not have them get shot out at mach 10 so :uspide_down:
maybe I'll make a custom gun system for us that isn't 50% duct tape at some point

demo video here

Changelog
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• tweak: The shining spring now shoots cleanades as a bouncing projectile that spreads space cleaner as it moves.

[Darkmajia]

i love the idea but this might need some adjustment: with a good rebound i can lock down a narrow hallway with slip tiles for 20 seconds with one shot

[ruddygreat]

oh yeah, I'll reduce the lifetime of the foam, it doesn't actually need to be 15s w/ the more active spreading.

[ruddygreat]

halved the foam lifetime & projectile friction, increased the projectile lifetime & speed a little because I wasn't quite happy w/ it.
should have roughly the same foam lifetime as a pre-this-change shining spring'd cleanade now

[Darkmajia]

this might need adjustment down the line but i will end your torture by merging this