Corrects 200+ instances of "it's" where it should've been "its" instead (#85169)

## About The Pull Request

it's - conjunction of "it" and "is"
its - possessive form of "it"

grammar is hard, and there were a lot of places where "it's" was used
where it shouldn't have been. i went and painstakingly searched the
entire repository for these instances, spending a few hours on it. i
completely ignored the changelog archive, and i may have missed some
outliers. most player-facing ones should be corrected, though
## Why It's Good For The Game
proper grammar is good

## Changelog
🆑
spellcheck: Numerous instances of "it's" have been properly replaced
with "its"
/🆑

code/controllers/master.dm

@@ -278,7 +278,7 @@ ADMIN_VERB(cmd_controller_view_ui, R_SERVER|R_DEBUG, "Controller Overview", "Vie
 		Initialize(20, TRUE, FALSE)
 
 // Please don't stuff random bullshit here,
-// Make a subsystem, give it the SS_NO_FIRE flag, and do your work in it's Initialize()
+// Make a subsystem, give it the SS_NO_FIRE flag, and do your work in its Initialize()
 /datum/controller/master/Initialize(delay, init_sss, tgs_prime)
 	set waitfor = 0