added a couple of tests for member names
Fixes some of U4-2633 Bundle all cache refresher transmissions into a single call per request for much better performance. See last note on issue.
U4-4837 - bugfix Umbraco.Core.EnumerableExtensions.InGroupsOf
Ensures that the batched distributed calls doesn't cache refresh the server executing the distributed calls since tht will already be done locally.
Ensures all caching is disabled for editing templates (master pages and views)
Completes: U4-5264 Add Count methods to IContentService, IMediaService, etc...
Merge remote-tracking branch 'origin/6.2.2' into 7.1.5

Conflicts:
	src/Umbraco.Core/Sync/DefaultServerMessenger.cs
	src/Umbraco.Tests/Services/ContentServiceTests.cs
Fixes: U4-5304 7.1.4 Media Picker can't view images RangeError: Maximum call stack size exceeded