Backports commit: Prefixed built in controllers to better avoid conflicts with people's custom code

Conflicts:
	src/Umbraco.Web.UI/Umbraco/PartialViewMacros/Templates/EditProfile.cshtml
	src/Umbraco.Web.UI/Umbraco/PartialViewMacros/Templates/Login.cshtml
	src/Umbraco.Web/Controllers/UmbLoginController.cs
	src/Umbraco.Web/Controllers/UmbLoginStatusController.cs
	src/Umbraco.Web/Controllers/UmbProfileController.cs
	src/Umbraco.Web/Controllers/UmbRegisterController.cs
	src/Umbraco.Web/Umbraco.Web.csproj