U4-4046 Rename "empty template" to "empty"
U4-2737 Snippets that are available when creating new MacroScripts should also be available for Partial Views
Hardcoded empty snippets need to be updated as well..
Merge remote-tracking branch 'origin/6.2.0' into 7.0.2

Conflicts:
	src/Umbraco.Web.UI/Umbraco.Web.UI.csproj
	src/Umbraco.Web.UI/Umbraco/create/PartialView.ascx.cs
	src/Umbraco.Web.UI/umbraco/create/PartialViewMacro.ascx
	src/Umbraco.Web.UI/umbraco/create/PartialViewMacro.ascx.cs