Import Jarcikon's original code.
Some housekeeping.
Incorporate Asteroids into the target list - fix by agises
  (http://forum.kerbalspaceprogram.com/threads/46956-0-23-Targetron-Target-or-command-vessel-from-a-list-of-active-flights%21?p=1061291&viewfull=1#post1061291)
Switch to blizzy's ToolbarWrapper / GUI cleanup.