Controls

 * `left click` select unit
 * `drag rect` select multiple  units
 * `right click` deselect unit(s)
 * `s` stop selected unit(s)
 * `space` fire front salvo

Tech

simple vehicle steering behaviour as desribed in http://www.red3d.com/cwr/steer/gdc99/

Todos

 * laser
 * behaviour: follow / arrival
 * better behaviour when moving: also avoid other friendly ships
 * server


Copyleft

http://opengameart.org/content/spaceships2-top-down
http://opengameart.org/content/gui-sound-effects
http://opengameart.org/content/space-background-asteroid
http://opengameart.org/content/static-noise-similar-untuned-tv-also-known-white-noise
http://opengameart.org/content/20-crosshairs-for-re
http://opengameart.org/content/interface-sounds-starter-pack (message)
http://opengameart.org/content/rts-commands-and-reports
http://opengameart.org/content/2-explosions