Add a couple of sound files.
Get rid of sound files that use third-party assets with NC licenses.
Add weaponEmpty.wav sound file that uses MIT-licensed source material.
Tweak assault rifle sounds & visuals.
Update AUTHORS file.
Update copyright notice.
Assault rifle: Add minimum pause of 160 ms between shots.
Blaster2: Add minimum pause of 160 ms between shots.
Fix assault rifle image fire animation duration.
Add version 4 of Blaster.
Use version 4 of Blaster.
Add version 5 of Blaster.
Make action #14 toggle between version 4 and 5 when using blaster.
Show "Switch weapon mode" in controls dialog.