Added nuget.core
Started some game feed code.
Added ConfigDirectory to Paths.
Changed GameFeedManager test.
Add feed validation method.
Finished hashing out adding and removing feeds.
Comments.
Key on names for feed urls.
Made Paths and SimpleConfig singletons for testing and dependency injection.
Sets singleton of SimpleConfig to its inteface, same with Paths
Made interface for GameFeedManager for tests and dependency injection
And that's how you make a singleton testable.
Tested GameFeedManager.AddFeed
Tested GameFeedManaget.GetFeeds
Tested GameFeedManager.RemoveFeed
Tested GameFeedManager.Dispose
Comment.
Logging for GameFeedManager
More test stuff.
Fixes #723