Add infecting marines, full hugger > chestburster > larva lifecycle and hugger leap/impregnation

[DrSmugleaf]

About the PR

Resolves #373
Resolves #232
Resolves #231
Resolves #221
Resolves #237
Resolves #222
Resolves #234
Resolves #223
Resolves #220

This adds:

• The leap ability.
• 3 second cooldown and 1 second delay for hugger leaping.
• The ability for huggers to leap and latch onto marines, knocking them unconscious for one and a half minutes and infecting them with a chestburster that will kill the marine and spawn a larva 8 minutes after infection.
• Sprite for the hugger being latched onto the marine and (after 10 seconds) detaching from the marine.
• Killing the hugger permanently after detaching from impregnation.
• Running and throwing animation for huggers.
• Sounds and sprite for chestbursting.
• Killing the marine permanently after chestbursting.
• Taking more than 10 damage at once cancels the hugger's leap doafter.

Not yet done (for a future PR):

• Latch-on sound and knockdown/shivers/screams towards the end of the infection
• Marking infected marines with an icon for xenos.
• Embryo removal surgery.
• Adjusting the throw strength depending on where the hugger clicked to leap to (right now its a constant strength of 30).
• Only attach the hugger if the marine was ~1 tile away from it (like in cm13) or if it clicks on a knocked-down marine with a short delay.
• Making hugger players immediately able to rejoin the game on the side of the hive if a slot is available.

Media

out.mp4

• I have added screenshots/videos to this PR showcasing its changes ingame, or this PR does not require an ingame showcase

[github-actions]

RSI Diff Bot; head commit c135aca merging into 21c7e3b
This PR makes changes to 1 or more RSIs. Here is a summary of all changes:

Resources/Textures/_CM14/Effects/chest_burst.rsi

State	Old	New	Status
burst_lie			Added
burst_stand			Added
bursted_lie			Added
bursted_stand			Added

Resources/Textures/_CM14/Mobs/Xenos/Hugger/hugger_impregnated.rsi

State	Old	New	Status
facehugger_impregnated			Added

Resources/Textures/_CM14/Mobs/Xenos/Hugger/hugger_mask.rsi

State	Old	New	Status
corgi			Added
corgi_puppy			Added
human			Added

Edit: diff updated after c135aca

[QuietlyWhisper]

Did you have to call it impregnation

[DrSmugleaf]

Did you have to call it impregnation

yes