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/GUI/DialogBoxes/ConsoleMessagesDialog.cs

@@ -31,10 +31,8 @@ namespace RimWorldAnimationStudio
 
         public void LogMessage(string logString, string stackTrace, LogType type)
         {
-            if (currentMessages > maxMessages)
-            { return; }
-
-            currentMessages++;
+            if (currentMessages > maxMessages) return;
+            currentMessages++; 
 
             currentMessage.text = logString;