Add vavoom 1.15.1,

Vavoom is a source port based on sources of Doom, Heretic,
Hexen and a little bit from Quake. To play Vavoom you need main
wad file from Doom, Ultimate Doom, Doom II, Heretic, Hexen or
Strife.

Differences from original game:

• Polygonal engine with colored lighting, with software mode,
• OpenGL support;
• Translucency;
• Complete support for freelook (look up & down) in all games;
• A powerful language to describe game logic;
• 100% client/server architecture with in-game joining;
• Quake-style console, with key bindings;
• Indirect support for DeHackEd;
• Crosshair;
• Jumping;

PR: ports/61765
Submitted by: Igor Pokrovsky <tiamat@comset.net>