Sideports a couple of init unit tests from Neb. (#7893)

* Sideports a couple of init unit tests from Neb.

* Trying to unfuck initialize logic.

* Removing del()s.

* Adjusting return values to Initialize().

* Moving some dangerous object logic from obj onto the two types that use it.

* Rolling back some init changes and commenting out initialized atom unit test.

* this comment formatting is a minor war crime

* Removed sleep() from signaler circuit Initialize().

* Additional Init fixes post-rebase.

* Uncomments subsystem test since that's passing.

code/controllers/subsystems/processing/chemistry.dm

@@ -22,6 +22,7 @@ PROCESSING_SUBSYSTEM_DEF(chemistry)
 /datum/controller/subsystem/processing/chemistry/Initialize()
 	initialize_chemical_reactions()
 	initialize_chemical_reagents()
+	..()
 
 //Chemical Reactions - Initialises all /datum/chemical_reaction into a list
 // It is filtered into multiple lists within a list.