Basic gibbing (#2973)

* Adds gibbing

* Adds adminbused absurd-damage foamblade

* Sane parts

* BaseOrgan -> BaseMechanism

* Do not do random offset on shared, fix killing oneself with click attacks

* BaseMechanism -> BaseHumanOrgan -> *stuff*

* Account for prediction, again

* Add gibbing sound

Content.Shared/GameObjects/Components/Body/Part/IBodyPart.cs

@@ -116,5 +116,10 @@ namespace Content.Shared.GameObjects.Components.Body.Part
         ///     false otherwise.
         /// </returns>
         bool DeleteMechanism(IMechanism mechanism);
+
+        /// <summary>
+        ///     Gibs the body part.
+        /// </summary>
+        void Gib();
     }
 }