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.
(DNN-4471) Check for null ModuleControl within ActionButton control
Fix build
AUTO-85 automate test cases for 'Admin Event Viewer' feature
Create SolutionInfo file - and start to link to projects
Link more projects to new SolutionInfo file
Link provider projects to new SolutionInfo.cs
Link remaining projects to new SolutionInfo.cs
New sqlDataProvider for 7.2.2
DNN-4379 Support multiple versions of getting started content