Bug fixes plus extra features

- Insert adds a new keyframe to the selected timeline
- New stages have frames cloned from the last frame of current stage
- Existing key are now replaced when another key is dropped on them
- Fixed bug where starting a new animation could result in errors

Assets/Scripts/AnimationComponents/Actor.cs

@@ -121,5 +121,12 @@ namespace RimWorldAnimationStudio
 
             return true;
         }
+
+        public int GetActorID()
+        {
+            if (Workspace.animationDef == null) return -1;
+
+            return Workspace.animationDef.actors.IndexOf(this);
+        }
     }
 }