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/modules/assembly/holder.dm

@@ -66,9 +66,9 @@
 /obj/item/device/assembly_holder/Moved(atom/old_loc, direction, forced = FALSE)
 	. = ..()
 	if(isturf(old_loc))
-		unsense_proximity(callback = .HasProximity, center = old_loc)
+		unsense_proximity(callback = /atom/proc/HasProximity, center = old_loc)
 	if(isturf(loc))
-		sense_proximity(callback = .HasProximity)
+		sense_proximity(callback = /atom/proc/HasProximity)
 
 /obj/item/device/assembly_holder/HasProximity(turf/T, atom/movable/AM, old_loc)
 	if(a_left)

code/modules/assembly/proximity.dm

@@ -90,9 +90,9 @@
 /obj/item/device/assembly/prox_sensor/Moved(atom/old_loc, direction, forced = FALSE)
 	. = ..()
 	if(isturf(old_loc))
-		unsense_proximity(range = range, callback = .HasProximity, center = old_loc)
+		unsense_proximity(range = range, callback = /atom/proc/HasProximity, center = old_loc)
 	if(isturf(loc))
-		sense_proximity(range = range, callback = .HasProximity)
+		sense_proximity(range = range, callback = /atom/proc/HasProximity)
 	sense()
 
 /obj/item/device/assembly/prox_sensor/tgui_interact(mob/user, datum/tgui/ui)