-Tweaked cargo spawn distances when based on asteroids

-Fixed pre-spawn cube block updates for cargo spawns
-Added method to PlayerMap for getting player name from steam id
-Added method to PlayerMap for getting/generating the virtual player for assigning block ownership to the server
-Fixed bug with new player join/leave events not firing
-Fixed misc bugs in PlayerMap
-Added BaseCubeBlocks to CubeGridEntity
-Updated chat and connected players list to show player name instead of steam id