Switch preferences to use json files for templates.

src/Mod/Path/PathScripts/PathPreferences.py

@@ -118,7 +118,10 @@ class PathPreferences:
 
     @classmethod
     def defaultJobTemplate(cls):
-        return cls.preferences().GetString(cls.DefaultJobTemplate)
+        template = cls.preferences().GetString(cls.DefaultJobTemplate)
+        if 'xml' not in template:
+            return template
+        return ''
 
     @classmethod
     def setJobDefaults(cls, filePath, jobTemplate, geometryTolerance):

src/Mod/Path/PathScripts/PathPreferencesPathJob.py

@@ -163,7 +163,7 @@ class JobPreferencesPage:
         foo = QtGui.QFileDialog.getOpenFileName(QtGui.qApp.activeWindow(),
                 "Path - Job Template",
                 path,
-                "job_*.xml")[0]
+                "job_*.json")[0]
         if foo:
             self.form.leDefaultJobTemplate.setText(foo)