Let them spit fire!

Enemies aren't that dangerous if they can't shoot, are they? Well, now Akrwor, Baqwor, and Czywor will happily shoot at the soldier - they do it in different ways, but the result is the same: deadly.

CHANGELOG

• Given Akrwor, Baqwor, and Czywor the capability of shooting.
• Touched up graphics of laser beams and explosions.
• Increased a bit pitch of Baqwor's roar.
• Replaced [PAUSE] with [F12] to pause/unpause (as they [PAUSE] key of one of my keybords does not send a release signal).
• Reworked video options: now the zoom factor is always set automatically (it gives a bit less freedom to the user, but at the same time it makes things easy for everybody).
• Updated manual.
• Made various internal improvements/bugfixes.