crawling adjustments

[Darkmajia]

fixes up a lot of imbalances and complaints about crawling without (hopefully) removing any whimsy or accidentally adjusting any other systems

this needs prediction added, but i couldn't figure it out. so. whatever

"ranged ai targets crawling people properly" commit uses code from Simple-Station/Einstein-Engines#530

Changelog
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• add: Standing up from prone no longer has a do-after, but standing up after falling over on purpose has a cooldown.
• remove: Crawling no longer lets you go under tables, plastic flaps, and other similar objects.
• fix: Shutters and firelocks can close over tables once again.
• fix: Ranged AI now targets crawling people properly.
• fix: Projectile grenades, such as stinger grenades, can now hit downed and crawling people.

[hivehum]

can you still slip under flaps

[Darkmajia]

its in my changelog

[hivehum]

slipping and crawling are different things

[Darkmajia]

oh. yeah. slips werent touched at all

[mqole]

prediction worries me a lil bit but the best way to test that is to just merge and see how we go. big fan of all these changes and bugfixes. wrt being able to slip under flaps/tables, i'm honestly not opposed to it, and as always if it becomes an issue we can just slam revert