Linter Introduction + Cleanup (#8085)

* Adds linter defines to repo.

* Uncomments linter defines already in the code.

* Resolves unreachable code linter errors.

* Nukes decade+ old syndie specops code except for computer since that's mapped in?????

* Resolves procs has no parent linter error.

* Proc signature fixes

* Bad comments

* "In" danger

* Type safety

* Implied nested list abuse

* Top level ..() usage

* Sleepy coder typos

* Invalid kwargs calls

* Pointless returns

* Linter hacks (see full message)

Byond doesn't care and it has no effect but linter doesn't like var/proc
for holding references to procs, despite that it's valid byond code.

Also, the linter seems to have serious issues figuring out relative
proc names. This commit is a sort of take-it-or-leave-it thing. It's not
required, it just cuts down on warnings, but this code is valid DM code.

* WHATEVER THIS IS

* Trick dreamchecker linter into ignoring this file's sins in it's weird use of vars

* Fix list decoration syntax - Its a list, not list of lists

- To declare that a var is a list you can `var/list/blah = list()` syntax or the `var/blah[0]` syntax.  Both do exactly the same thing. But if you do `var/list/blah[0]` that is just like doing `var/list/list/blah = list()`

* Hopefully stops the ai holder subtype folder from going quantum and sometimes changes capitalization over time, and incidentally causing 20+ linter errors.

* Fixes unwrapped negated object in list linter error.

* Resolves colon-like list accessing linter error.

* Turns linter on in linter config.

* Fixes closet indentation properly and cleans up suit storage unit switch.

Co-authored-by: Aronai Sieyes <arokha@arokha.com>
Co-authored-by: Leshana <Leshana@users.noreply.github.com>

code/game/gamemodes/events/dust.dm

@@ -106,7 +106,7 @@ The "dust" will damage the hull of the station causin minor hull breaches.
 			if(life <= 0)
 				walk(src,0)
 				qdel(src)
-				return 0
+				return
 	return
 
 

code/game/gamemodes/events/holidays/Holidays.dm

@@ -127,7 +127,7 @@ var/global/list/Holiday = list() //Holidays are lists now, so we can have more t
 		if(8)	//Aug
 			switch(DD)
 //				if(10)
-//					Holiday["S'randarr's Day"] = "A Tajaran holiday that occurs on the longest day of the year in summer, \
+//					Holiday["S'randarr's Day"] = "A Tajaran holiday that occurs on the longest day of the year in summer,
 //					on Ahdomai. It is named after the Tajaran deity of Light, and huge celebrations are common."
 				if(27)
 					Holiday["Forgiveness Day"] = "A time to forgive and be forgiven."
@@ -161,8 +161,8 @@ var/global/list/Holiday = list() //Holidays are lists now, so we can have more t
 					Holiday["Kindness Day"] = "Kindness Day is an unofficial holiday to highlight good deeds in the \
 					community, focusing on the positive power and the common thread of kindness which binds humanity and \
 					friends together."
-//				if(28) //Space thanksgiving.
-//					Holiday["Appreciation Day"] = "Originally an old holiday from Earth, Appreciation Day follows many of the \
+				if(28) //Space thanksgiving.
+					Holiday["Appreciation Day"] = "Originally an old holiday from Earth, Appreciation Day follows many of the \
 					traditions that its predecessor did, such as having a large feast (turkey often included), gathering with family, and being thankful \
 					for what one has in life."
 			if(28 > DD > 20)