Add a clear function to String

Co-authored-by: r3cp3ct <45179536+r3cp3ct@users.noreply.github.com>
Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

src/sig/engine/String.java

@@ -57,6 +57,11 @@ public class String{
         return this.sb.indexOf(str);
     }
 
+    public void clear() {
+        this.sb.setLength(0);
+        bounds = new Point(0,1);
+    }
+
     /**
      * Returns the index within this string of the first occurrence of the
      * specified substring, starting at the specified index.

src/sig/objects/EditorRenderer.java

@@ -80,8 +80,12 @@ public class EditorRenderer extends LevelRenderer{
         if (messageLog.length()>0) {
             if (System.currentTimeMillis()-last_message_log>MESSAGE_TIME) {
                 last_message_log=System.currentTimeMillis();
-                int secondMarker = messageLog.indexOf("\n",messageLog.indexOf("\n")+1);
+                if (messageLog.length()>1) {
-                messageLog.replace(messageLog.indexOf("\n"), secondMarker==-1?messageLog.length():secondMarker, "");
+                    int secondMarker = messageLog.indexOf("\n",messageLog.indexOf("\n")+1);
+                    messageLog.replace(messageLog.indexOf("\n"), secondMarker==-1?messageLog.length():secondMarker, "");
+                } else {
+                    messageLog.clear();
+                }
             }
         }
     }