Upgraded Google Analytics add-on

Moved from UI Add-on to Nuget add-on. This means updating to latest
EPiServer.Packaging too. Moved all modules into /modules/_protected/
with the Move-EPiServerProtectedModules cmdlet in the Package Manager
Console.
Nice to know docs

Starting Commerce Manager and how to update the databases yourself.
Found a trace of EPiServer Common

We're not using it. Gone now.
Removed ModulesRepository

Not needed, major cleanup.
Replaced VisitorGroupsCriteriaPack add-on with the one from the nuget feed.
Added Commerce Manger integration for the web site. This will show the Commerce Manager link under the Commerce global menu.
Forgot project file changes for CM integration