!Bubble Command

Changes to Server.cs involve the !help message
Tweak !bubble help text
Added /autoDekessler and /autoDekesslerTimer to server commands
Switch to FlightGlobals.ship_position for current vessel position
Should either make most positions more accurate, or break things terribly
Server will now end process when user inputs /quit while the server is hosting
Fix #325
Close the add server bar in the connection window after the server is added to the favourites list and select the new server in the list.
Change default connection window size to prevent flicker.
;-)
Save & Folder validation uses executing directory