Improved error-checking for empty plugin updates
Mass is no longer shown in details if too small
Added some error-checking to client/server message id parsing from message header
Cleaned up some unnessary variables
Added a button to Viewer window to focus on a targeted player's vessel in map-view
Players in info display list and viewer list are now sorted alphabetically
Map-focus button will enter map-view if it is not already active
Added /list and /count server commands
Fixed possibility of simultaneous thread console writing in server