Fixes tesla coil hell contraptions (#52889)

Removes the ability for tesla coils to generate power with more then 85% efficiency.
Cleans up the remainder of my zap_act refactor, making the proc better fit its usecase and removing some unneeded code.
Adds a check in the tesla coil zap() proc that makes sure we're not trying to use power that's not there.
Removes some seemingly complex math from said proc, replaces it with a static 20% draw * the efficiency.

code/modules/mob/transform_procs.dm

@@ -419,7 +419,7 @@
 	if(client)
 		R.updatename(client)
 
-	if(mind)		//TODO
+	if(mind)		//TODO //TODO WHAT
 		if(!transfer_after)
 			mind.active = FALSE
 		mind.transfer_to(R)