Get rid of CuffSystem, make CuffableComponent update its hand count properly (#1927)

* Merge branch 'master' of https://github.com/space-wizards/space-station-14 into cuff-fix

* yml

* event bus

Resources/Prototypes/Entities/Mobs/Species/human.yml

@@ -94,6 +94,7 @@
       color: "#ffffff"
       sprite: Objects/Misc/handcuffs.rsi 
       state: body-overlay-2
+      visible: false
     - map: ["enum.Slots.IDCARD"]
     - map: ["enum.Slots.GLOVES"]
     - map: ["enum.Slots.SHOES"]
@@ -231,6 +232,7 @@
         color: "#ffffff"
         sprite: Objects/Misc/handcuffs.rsi 
         state: body-overlay-2
+        visible: false
       - map: ["enum.Slots.IDCARD"]
       - map: ["enum.Slots.GLOVES"]
       - map: ["enum.Slots.SHOES"]