Online->offline port

* Made (almost) everything load from config.xml rather than being hardcoded
* Started moving the networking onto the main menu so you can load up any map (currently only "level_full" works)
* Added ability to change map to netLobby for voting
* Moved the BallMarker script to be dynamically loaded
* Config.xml now saves your online player and server names
* Added new tags for map makers
* Map makers can now assign a spawn location and a lowest height in a level
* Changed a reference to main.Camera in a few places to the nvs one
* Changed server-client movement messages ready for interpolation method