Synths can now charge from cyborg chargers (Bubberstation#716)

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## About The Pull Request

Part 3 of my synthcentric update series (Yes we are far from done)

My insanity grows. You can probably deduce what this does, it is
literally the title.

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## Why It's Good For The Game

Robot charge in robot charger, good, yes?
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:cl:
add: Synths can now charge in cyborg chargers
/:cl:

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---------

Co-authored-by: The Sharkening <[email protected]>

modular_zubbers/code/modules/synths/code/bodyparts/stomach.dm

@@ -0,0 +1,25 @@
+/obj/item/organ/internal/stomach/synth/Insert(mob/living/carbon/receiver, special, drop_if_replaced)
+	. = ..()
+	add_synth_signals(receiver)
+
+/obj/item/organ/internal/stomach/synth/Remove(mob/living/carbon/stomach_owner, special)
+	. = ..()
+	remove_synth_signals(stomach_owner)
+
+/obj/item/organ/internal/stomach/synth/proc/add_synth_signals(mob/living/carbon/stomach_owner)
+	SIGNAL_HANDLER
+	RegisterSignal(stomach_owner, COMSIG_PROCESS_BORGCHARGER_OCCUPANT, PROC_REF(on_borg_charge))
+
+/obj/item/organ/internal/stomach/synth/proc/remove_synth_signals(mob/living/carbon/stomach_owner)
+	SIGNAL_HANDLER
+	UnregisterSignal(stomach_owner, COMSIG_PROCESS_BORGCHARGER_OCCUPANT)
+
+/obj/item/organ/internal/stomach/synth/proc/on_borg_charge(datum/source, amount)
+	SIGNAL_HANDLER
+
+	// This is so it isn't completely instant
+	amount /= 200
+	if(owner.nutrition < NUTRITION_LEVEL_WELL_FED)
+		owner.nutrition += amount
+		if(owner.nutrition > NUTRITION_LEVEL_FULL)
+			owner.nutrition = NUTRITION_LEVEL_ALMOST_FULL

tgstation.dme

@@ -8058,6 +8058,7 @@
 #include "modular_zubbers\code\modules\surgery\bodyparts\species_parts\misc_bodyparts.dm"
 #include "modular_zubbers\code\modules\surgery\organs\internal\lungs\_lungs.dm"
 #include "modular_zubbers\code\modules\synths\code\bodyparts\brain.dm"
+#include "modular_zubbers\code\modules\synths\code\bodyparts\stomach.dm"
 #include "modular_zubbers\code\modules\synths\code\bodyparts\internal_computer\internal_computer.dm"
 #include "modular_zubbers\code\modules\traitor\goal_overrides.dm"
 #include "modular_zubbers\code\modules\vending\halloween_chocolate.dm"