U4-4575 - property converters use wrong source value
U4-4575 - fix 8371105
Manually picked up PR #343
Merge branch '6.2.0' of https://github.com/umbraco/Umbraco-CMS into 7.1.0

Conflicts:
	src/Umbraco.Core/Services/IRelationService.cs
	src/Umbraco.Web/Models/PublishedProperty.cs
	src/Umbraco.Web/PublishedCache/MemberPublishedContent.cs
One more ImageProcessor update
Fixes: U4-4592 U7.1 - You can trigger a lot  "Unsaved changes" bars
Hardcodes starterkit guid into the installer

This way we can change it remotely to another package instead of relying
on just getting the first guid in the collection of kits
Merge branch '7.1.0' of https://github.com/umbraco/Umbraco-CMS into 7.1.0