Separated interface classes into their own files.
Merge remote-tracking branch 'remotes/origin/dev-wordpress' into dev-wordpress

Conflicts:
	SourceCodes/WeirdFeird.ViewModels/Interfaces/Rss/IChannel.cs
	SourceCodes/WeirdFeird.ViewModels/Interfaces/Rss/IEnclosure.cs
	SourceCodes/WeirdFeird.ViewModels/WeirdFeird.ViewModels.csproj