Bug 1074040 - [Stingray] fork system, remove useless modules and add support of landing app
Merge pull request #25247 from huchengtw-moz/bug-1074040-fork-add-landing-app

Bug 1074040 fork add landing app, r=alive, evelyn
fully refactored PP but still in dev_apps
patches to fix most bugs and move to apps
changes to address all requests
[Privacy Panel] push request
 Changes proposed by Tim