Moving shit around and APC repair bugfix (#20912)

* Moving shit around so turfs aren't defined in code/modules/mining .
Fixes APC's integrity not being reset to max when a broken APC is repaired.

* derp

* More turf and turf procs moved.

* fixing merge conflicts again.

code/modules/power/apc.dm

@@ -547,6 +547,7 @@
 			user << "<span class='notice'>You replace the damaged APC frame with a new one.</span>"
 			qdel(W)
 			stat &= ~BROKEN
+			obj_integrity = max_integrity
 			malfai = null
 			malfhack = 0
 			if (opened==2)

code/modules/power/engine.dm

@@ -1,16 +0,0 @@
-/turf/open/floor/engine/attack_paw(mob/user)
-	return src.attack_hand(user)
-
-/turf/open/floor/engine/attack_hand(mob/user)
-	user.Move_Pulled(src)
-
-/turf/open/floor/engine/ex_act(severity, target)
-	contents_explosion(severity, target)
-	switch(severity)
-		if(1)
-			ChangeTurf(src.baseturf)
-		if(2)
-			if(prob(50))
-				ChangeTurf(src.baseturf)
-		else
-			return