Draft: move DraftSnap to another module

And do not load the `Snapper` in `DraftGui`.
The Snapper should be initialized by the module
that imports `DraftGui`, most probably `DraftTools`
or even by the `InitGui` of the workbench.

src/Mod/Draft/CMakeLists.txt

@@ -10,7 +10,6 @@ SET(Draft_SRCS_base
     Draft.py
     DraftTools.py
     DraftGui.py
-    DraftSnap.py
     DraftTrackers.py
     DraftVecUtils.py
     DraftGeomUtils.py
@@ -85,6 +84,7 @@ SET(Draft_GUI_tools
     draftguitools/gui_polararray.py
     draftguitools/gui_arrays.py
     draftguitools/gui_snaps.py
+    draftguitools/gui_snapper.py
     draftguitools/README.md
 )
 

src/Mod/Draft/DraftGui.py

@@ -2452,6 +2452,3 @@ class ShapeStringTaskPanel:
 if not hasattr(FreeCADGui,"draftToolBar"):
     FreeCADGui.draftToolBar = DraftToolBar()
 #----End of Python Features Definitions----#
-
-if not hasattr(FreeCADGui,"Snapper"):
-    import DraftSnap

src/Mod/Draft/DraftTools.py

@@ -40,14 +40,14 @@ import sys, os, FreeCAD, FreeCADGui, WorkingPlane, math, re, Draft, Draft_rc, Dr
 from FreeCAD import Vector
 from PySide import QtCore,QtGui
 from DraftGui import todo, translate, utf8_decode
-import DraftSnap
+import draftguitools.gui_snapper as gui_snapper
 import DraftGui
 import DraftTrackers
 from DraftTrackers import *
 from pivy import coin
 
 if not hasattr(FreeCADGui, "Snapper"):
-    FreeCADGui.Snapper = DraftSnap.Snapper()
+    FreeCADGui.Snapper = gui_snapper.Snapper()
 
 if not hasattr(FreeCAD, "DraftWorkingPlane"):
     FreeCAD.DraftWorkingPlane = WorkingPlane.plane()