Convert Util to internal class
Remove PrimitiveReader

Not used in solution.
Convert various classes to internal
Convert some Vector methods to internal
Switch TdfNode.IndentationLevel constant to private
Switch TdfNode.WriteTdf from protected to private
Switch ArrayPalette.DistanceSquared to private
Switch some TileAttr methods to internal
Convert Util.Size struct to internal
Document public facing code
Update stylecop configuration

Turn on the documentation rules now that we have documentation.
Re-enable Hungarian notation rule.
Generate XML documentation for DLLs