Update ModuleController.cs

As commented line 875 "Synchronize module is called when a module needs to indicate that the content has changed and the cache's should be refreshed." But the cache isn't refresh.
Fixed by adding the clear cache Line 886
Create doubletaptogo.js

https://dnntracker.atlassian.net/browse/DNN-3910
Create doubletaptogo.min.js

https://dnntracker.atlassian.net/browse/DNN-3910
Update Home.ascx

https://dnntracker.atlassian.net/browse/DNN-3910
Update 2-Col.ascx

https://dnntracker.atlassian.net/browse/DNN-3910
Update 3-Col-Social.ascx

https://dnntracker.atlassian.net/browse/DNN-3910
Update 3-Col.ascx

https://dnntracker.atlassian.net/browse/DNN-3910
Update 404Skin.ascx

https://dnntracker.atlassian.net/browse/DNN-3910
Update groups.ascx

https://dnntracker.atlassian.net/browse/DNN-3910
Revert "Update ModuleController.cs"

This reverts commit a3c8d2bf7c70b82be247efef3def25b752025b7b.
Update dnn.DropDownList.css

Rule ".dnnDropDownList .dt-container ul, li {" applied for all <li> elements, but must be only to <li> elements inside .dnnDropDownList .dt-container ul.
Fix build
Update Assembly to "Stable" in Release Branch
DNN-4379 Support multiple versions of getting started content
DNN-4380 Localize getting started
Fix bug DNN-4533: update sp GetFoldersByPermissions to handle the situation when userid is null.
DNN-4379 Support multiple versions of getting started content
DNN-4308 fixed object qualifier issue.
Rollback all changes in GetFolderPermissions
DNN-4605 Upgrade from 7.2.0 to 7.2.1.360 (Content EVOQ) failed due to SQL Script error