Robot_module and cyborg stack refactor (#13527)

* robot_module refactor

* some fixes

1. adds medical stacks of 25 for the syndi medical borg
2. fixes various construction steps that weren't using `use()` or `get_amount()`

* review tweaks + other stuff

1. Makes a bunch of for loops into istypeless loops
2. Adds a readout of the current out of stacks a borg has, in the status panel
3. Slightly reorganizes the medical, syndi medical, engineering and syndi engineering cyborgs items

* fixes after upstream merge

* blank line for travis

* fixes and improvements

1. Fixed welder icon's not updating periodically if you were charging in a borg recharger
2. Fixes solar panels dropping /cyborg type glass when they were deconstructed.
3. Band-aid fix (incase #2 doesn't fix this) for cyborg stack's `source` var being null which resulted in tons of "cannot read null.energy" runtimes

* more fixes + constructable frame runtime fix

* removes toy sword placeholder

remove comment

* remove these as well

* .amount to .get_amount(), really should have done this before

* refactors robot_upgrades to work with the new system

- more cleanup
- adds documentation
- fixed a bug I made where you could delete your robot stack via crafting

* moves some unemag logic to the module file, makes more loops typless

* farie review

* fox review

* affected review and more TM bugfixes

* fixes comment

Co-authored-by: SteelSlayer <SteelSlayer@users.noreply.github.com>

code/datums/helper_datums/construction_datum.dm

@@ -47,7 +47,7 @@
 /datum/construction/proc/custom_action(step, used_atom, user)
 	if(istype(used_atom, /obj/item/stack/cable_coil))
 		var/obj/item/stack/cable_coil/C = used_atom
-		if(C.amount<4)
+		if(C.get_amount() < 4)
 			to_chat(user, ("<span class='warning'>There's not enough cable to finish the task.</span>"))
 			return 0
 		else
@@ -55,7 +55,7 @@
 			playsound(holder, C.usesound, 50, 1)
 	else if(istype(used_atom, /obj/item/stack))
 		var/obj/item/stack/S = used_atom
-		if(S.amount < 5)
+		if(S.get_amount() < 5)
 			to_chat(user, ("<span class='warning'>There's not enough material in this stack.</span>"))
 			return 0
 		else
@@ -113,7 +113,7 @@
 		// STACKS
 		if(istype(used_atom,/obj/item/stack))
 			var/obj/item/stack/stack=used_atom
-			if(stack.amount < amount)
+			if(stack.get_amount() < amount)
 				to_chat(user, "<span class='warning'>You don't have enough [stack]! You need at least [amount].</span>")
 				return 0
 			stack.use(amount)