Methods that return paths should be consistent with inclusion of source and destination

[FaronBracy]

The DepthFirstPaths class has a PathTo method that returns a list of vertices from source to destination
https://github.com/FaronBracy/RogueSharp/blob/master/RogueSharp/PathFinder.cs#L100
The source vertex is not included in the list.

This behavior is different from the PathFinder class's ShortestPath method which does include the source cell.
https://github.com/FaronBracy/RogueSharp/blob/master/RogueSharp/PathFinder.cs#L100

The behavior should be consistent across all methods that return paths