More undo goodies;

- Undo for editmode Font object
- Undo for posemode :)
  (btw; it also means posemode remains active on file load)

source/blender/include/BIF_editfont.h

@@ -42,6 +42,7 @@ void remake_editText(void);
 void free_editText(void);
 void paste_editText(void);
 void txt_export_to_object(struct Text *text);
+void undo_push_font(char *);
 
 /**
  * @attention The argument is discarded. It is there for