refactor Sanity

Logic is more modular with many more unit tests.
Reduced dependence on GUI
Cleaner template structure

src/Mod/CAM/Path/GuiInit.py

@@ -52,9 +52,10 @@ def Startup():
 
         from Path.Main.Gui import Fixture
         from Path.Main.Gui import Inspect
-        from Path.Main.Gui import Sanity
         from Path.Main.Gui import Simulator
 
+        from Path.Main.Sanity import Sanity
+
         from Path.Op.Gui import Adaptive
         from Path.Op.Gui import Array
         from Path.Op.Gui import Comment