Refactoring body system to use containers and general body cleanup (#20202)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Resources/Prototypes/Body/Prototypes/a_ghost.yml

@@ -6,17 +6,17 @@
     torso:
       part: TorsoHuman
       connections:
-      - left arm
-      - right arm
-    right arm:
+      - left_arm
+      - right_arm
+    right_arm:
       part: RightArmHuman
       connections:
-      - right hand
-    left arm:
+      - right_hand
+    left_arm:
       part: LeftArmHuman
       connections:
-      - left hand
-    right hand:
+      - left_hand
+    right_hand:
       part: RightHandHuman
-    left hand:
+    left_hand:
       part: LeftHandHuman

Resources/Prototypes/Body/Prototypes/human.yml

@@ -13,37 +13,37 @@
     torso:
       part: TorsoHuman
       connections:
-      - left arm
-      - right arm
-      - left leg
-      - right leg
+      - left_arm
+      - right_arm
+      - left_leg
+      - right_leg
       organs:
         heart: OrganHumanHeart
         lungs: OrganHumanLungs
         stomach: OrganHumanStomach
         liver: OrganHumanLiver
         kidneys: OrganHumanKidneys
-    right arm:
+    right_arm:
       part: RightArmHuman
       connections:
-      - right hand
-    left arm:
+      - right_hand
+    left_arm:
       part: LeftArmHuman
       connections:
-      - left hand
-    right hand:
+      - left_hand
+    right_hand:
       part: RightHandHuman
-    left hand:
+    left_hand:
       part: LeftHandHuman
-    right leg:
+    right_leg:
       part: RightLegHuman
       connections:
-      - right foot
-    left leg:
+      - right_foot
+    left_leg:
       part: LeftLegHuman
       connections:
-      - left foot
-    right foot:
+      - left_foot
+    right_foot:
       part: RightFootHuman
-    left foot:
+    left_foot:
       part: LeftFootHuman