Debugger: split editor related code off watchutils.{h,cpp}

This is now in sourceutils.{h,cpp} to make watchutils.{h,cpp}
better acessible to the debugger auto-tests.

Change-Id: Ie87e715bc7018ca190a460c37dfd19bc897059f0
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/debugger/pdb/pdbengine.cpp

@@ -42,6 +42,7 @@
 #include "moduleshandler.h"
 #include "registerhandler.h"
 #include "stackhandler.h"
+#include "sourceutils.h"
 #include "watchhandler.h"
 #include "watchutils.h"