FF4 - header file reorg

- Added new util.h and text.h header files.
- Corresponding edits.

src/edit.cpp

@@ -33,6 +33,11 @@
 #include <stdlib.h>
 #include <limits.h>
 #include <string.h>
+#include "T.h"
+#include "TDB.h"
+#include "Date.h"
+#include "text.h"
+#include "util.h"
 #include "task.h"
 
 ////////////////////////////////////////////////////////////////////////////////