<!-- Remove this text and explain what the purpose of your PR is.

Mention if you have tested your changes. If you changed a map, make sure
you used the mapmerge tool.
If this is an Issue Correction, you can type "Fixes Issue #169420" to
link the PR to the corresponding Issue number #169420.

Remember: something that is self-evident to you might not be to others.
Explain your rationale fully, even if you feel it goes without saying.
-->

Part 2 - this includes porting the actual status_effect datum, modifying
it to fit our purposes by backing it with timers similarly to old
system, and finally implementing KD, KO and Stun with it.

This contains Part 1 PR (#4828) so if you want to take a look at it I'd
advise checking the last commits or setting up a compare between both
branches.

Predictable status timers. Current ones are bogus in their handling of
"life tick correction" and will "stack" time even when they're not
supposed to.

Also provides a more robust backend for general effects, and integrates
status effects into it.

Summary testing of buckling interactions, explosion knock times,
crawling, resting. Will have to be expanded once part 1 is ready

:cl:
add: Added Buckled, Handcuffed and Legcuffed screen alerts
code: Ported /tg/ status effects backend, modified with timers to let
effects end at appropriate time
code: Stun, Knockdown and Knockout now use the new effects backend
balance: Due to backend change, all KO/KD/Stuns may behave differently
timing wise. This is of course subject to adjustments.
balance: Endurance is now set at 8% effect duration reduction per level
above 1. However it now compounds with species bonus. Feel free to
adjust.
balance: Knockdowns are not inherently incapacitating anymore and many
sources of it have been updated to also stun to make up for it.
fix: KO/KD/Stuns do not artificially and randomly ''stack'' due to
incorrect timer offset calculation anymore.
fix: Stuns now correctly apply Stun reduction values instead of
Knockdown reductions.
fix: Crawling can now be interrupted by a normal move, if you are fit
enough to do so.
/:cl:

---------

Co-authored-by: forest2001 <[email protected]>

correcting mistakes in the merging process

# About the pull request

Depends on Part 2 (#4842), reopening of #4844

Refactors daze and speech problems handling to back them by new
status_effect-s and traits, fixes a few bugs, and gets rid of an unused
and horrible bay12 relic horsehead with snowflake speech handling

This just generally makes it more reliable timewise and allows further
interactions in the future

:cl:
code: Refactored Daze to use new Status backend
fix: Dazed screen effect now applies immediately
fix: Stuttering now starts properly when dazed
del: Removed unused disabilities code
del: Removed an old, goofy and unused decade old horse mask
/:cl:

---------

Co-authored-by: forest2001 <[email protected]>

# About the pull request

stun when exiting maintenance stations like in
/obj/structure/closet/proc/dump_contents()
<!-- Remove this text and explain what the purpose of your PR is.

Mention if you have tested your changes. If you changed a map, make sure
you used the mapmerge tool.
If this is an Issue Correction, you can type "Fixes Issue #169420" to
link the PR to the corresponding Issue number #169420.

Remember: something that is self-evident to you might not be to others.
Explain your rationale fully, even if you feel it goes without saying.
-->

# Explain why it's good for the game

makes it function similarly to other places mobs can hide in
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl: Lok1
add: maintenance stations stun when exiting like closets
/:cl:

---------

Co-authored-by: SabreML <[email protected]>

cmss13-devs/cmss13#4842 - after we moved to the
TG system for many status effects, certain things needed to be converted
from WEAKEN to Stun/KnockDown in order to function properly - for
example tablestunning was converted in that PR. From testing, it seems
like flash, flashbang needs to be converted as well.

# Explain why it's good for the game

Fixes weird flash/flashbang issue(s)

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
fix: converts flash, flashbang to TG effect system, fixing issue(s)
/:cl:

fix merge issue, lurkers kept flickering their invisibility