cinnamon-settings: migrate to using python-xapp widgets and remove dups

files/usr/share/cinnamon/cinnamon-settings/bin/CinnamonGtkSettings.py

@@ -10,7 +10,7 @@
 gi.require_version("Gtk", "3.0")
 from gi.repository import GLib, Gtk, Gio, GObject
 
-from  SettingsWidgets import SettingsWidget, Range, Switch
+from xapp.SettingsWidgets import SettingsWidget, Range, Switch
 
 SETTINGS_GROUP_NAME = "Settings"
 

files/usr/share/cinnamon/cinnamon-settings/bin/ExtensionCore.py

@@ -15,7 +15,8 @@
 gi.require_version('Gtk', '3.0')
 from gi.repository import Gio, Gtk, GObject, Gdk, GdkPixbuf, Pango, GLib
 
-from SettingsWidgets import SidePage, SettingsStack, SettingsPage, SettingsWidget, SettingsLabel
+from xapp.SettingsWidgets import SettingsStack, SettingsPage, SettingsWidget, SettingsLabel
+from SettingsWidgets import SidePage
 from Spices import Spice_Harvester, ThreadedTaskManager
 
 home = os.path.expanduser('~')

files/usr/share/cinnamon/cinnamon-settings/bin/JsonSettingsWidgets.py

@@ -1,13 +1,18 @@
 #!/usr/bin/python3
 
 from gi.repository import Gio, GObject
-from SettingsWidgets import *
+from xapp.SettingsWidgets import *
+from SettingsWidgets import SoundFileChooser, TweenChooser, EffectChooser, DateChooser, Keybinding
+from xapp.GSettingsWidgets import CAN_BACKEND as px_can_backend
+from SettingsWidgets import CAN_BACKEND as c_can_backend
 from TreeListWidgets import List
+import os
 import collections
 import json
 import operator
 
-CAN_BACKEND.append("List")
+can_backend = px_can_backend + c_can_backend
+can_backend.append('List')
 
 JSON_SETTINGS_PROPERTIES_MAP = {
     "description"      : "label",
@@ -315,5 +320,5 @@ def __init__(self, key, settings, properties):
 
     return NewClass
 
-for widget in CAN_BACKEND:
+for widget in can_backend:
     globals()["JSONSettings"+widget] = json_settings_factory(widget)