ui settings restore upgrade

* added ability to export/save settings as json using GetSettings

* added generic copyFile method instead of duplicating

* copy and load settings file after file restore (right now only reads)

* set settings values from backup when differ than current

* store settings as part of validation file

* prompt for settings restore or set always via toggle

* unused import

* added new strings for settings restore

* updated changelog

* fix pep8 syntax

* swap setting to always prompt instead of always restore (invert)

addon.xml

@@ -7,9 +7,9 @@
     <import addon="script.module.future" version="0.18.2+matrix.1" />
     <import addon="script.module.dropbox" version="9.4.0" />
   </requires>
-  <extension point="xbmc.python.script" library="default.py"> 
-     <provides>executable</provides> 
-  </extension> 
+  <extension point="xbmc.python.script" library="default.py">
+     <provides>executable</provides>
+  </extension>
   <extension point="xbmc.service" library="service.py" />
   <extension point="xbmc.addon.metadata">
     <summary lang="ar_SA">إنسخ إحتياطياً قاعده بيانات إكس بى إم سى وملفات اﻹعدادات فى حاله وقوع إنهيار مع إمكانيه اﻹسترجاع</summary>
@@ -91,6 +91,7 @@
     </assets>
     <news>Version 1.6.4
  - updated deprecated Kodi python methods
+ - added better system settings/restore functionality (enabled by default)
 </news>
   </extension>
 </addon>