[TD] DrawUtil: remove unused includes

- also sort includes
- also move a definition to it
- also adapt two Gui files accordingly

src/Mod/TechDraw/App/EdgeWalker.cpp

@@ -44,7 +44,6 @@
 
 #include "EdgeWalker.h"
 #include "DrawUtil.h"
-#include "EWTOLERANCE.h"
 
 
 using namespace TechDraw;