replaced mauvebot and urrebot with havocbot (Urre didn't want me to keep

replaced mauvebot and urrebot with havocbot (Urre didn't want me to keep
mauvebot and urrebot)
this does not use the .nnl files (currently), instead it has a separate
.waypoints format, however these are very quick and easy to make, and it
can navigate some very item-filled levels without them
much of the bot utility code is in bots.c and only the (small) bot ai
resides in havocbot.c
havocbot_roles.qc has the gamemode-dependent ai for goal selection
(currently only DM)

git-svn-id: svn://svn.icculus.org/nexuiz/trunk@1335 f962a42d-fe04-0410-a3ab-8c8b0445ebaa