Fixed things  so we can compile

added getter bodies for atlas tools classes Age fields
removed some dupe "Using" statements.
CL argument system and DataMigrator class

Added some commandline arg parsing BS to Program.cs

Added DataMigrator class with functionality to migrate old data to
MongoDB. Undone / tested.

Migrated old PlayerInfo and MapData classes over to DataMigrator.

Added "AddMap" and "AddUser" functionality to MapManager and UserManager
classes.