Hardsuit powersink module now uses CELLRATE properly

- Adds CELLRATE (and SMESRATE for SMESs) into drain_power proc.
- Adds "amount" parameter to drain power proc, sets the powersink module to 40kW draw (80 cell charge/s), which should correspond with normal cell recharger.
- Removes drain_power from all machinery, and adds drain_power to machinery/power. This means you can only drain from machines that have something to do with wiring or electricity.

code/modules/mob/living/silicon/robot/robot.dm

@@ -182,7 +182,7 @@ var/list/robot_verbs_default = list(
 		lawsync()
 		photosync()
 
-/mob/living/silicon/robot/drain_power(var/drain_check)
+/mob/living/silicon/robot/drain_power(var/drain_check, var/surge, var/amount = 0)
 
 	if(drain_check)
 		return 1
@@ -190,14 +190,15 @@ var/list/robot_verbs_default = list(
 	if(!cell || !cell.charge)
 		return 0
 
-	if(cell.charge)
-		src << "<span class='danger'>Warning: Unauthorized access through power channel 12 detected.</span>"
-		var/drained_power = rand(200,400)
-		if(cell.charge < drained_power)
-			drained_power = cell.charge
-			cell.use(drained_power)
-			return drained_power
+	// Actual amount to drain from cell, using CELLRATE
+	var/cell_amount = amount * CELLRATE
 
+	if(cell.charge > cell_amount)
+		// Spam Protection
+		if(prob(10))
+			src << "<span class='danger'>Warning: Unauthorized access through power channel [rand(11,29)] detected!</span>"
+		cell.use(cell_amount)
+		return amount
 	return 0
 
 // setup the PDA and its name

code/modules/mob/mob.dm

@@ -66,7 +66,7 @@
 // If drain_check is set it will not actually drain power, just return a value.
 // If surge is set, it will destroy/damage the recipient and not return any power.
 // Not sure where to define this, so it can sit here for the rest of time.
-/atom/proc/drain_power(var/drain_check,var/surge)
+/atom/proc/drain_power(var/drain_check,var/surge, var/amount = 0)
 	return -1
 
 // Show a message to all mobs in earshot of this one