Fix compiling game VM with OBSTACLEDEBUG defined
mint-arena: Add game system call to only clip to entities

trap_ClipToEntities is the same as trap_Trace except it doesn't clip to world.
mint-arena: BotCheckBlocked, don't clip to world

BotCheckBlocked does a trace to see if there is an entity blocking the bot.
However, trap_Trace clips to the world and can cause entities to go unnoticed.

So specifically only clip to entities. The distance of trace (3 units) is short
enough we don't need to be concerned about it going through walls (hopefully...).

Remove checking for ENTITYNUM_WORLD because it won't be returned by
trap_ClipToEntities.

----

To see when the bug is occuring, do something like

trap_Trace(&trace, ms->origin, mins, maxs, end, ms->entitynum, MASK_PLAYERSOLID);
trap_ClipToEntities(&trace2, ms->origin, mins, maxs, end, ms->entitynum, MASK_PLAYERSOLID);

if ( trace.entityNum != trace2.entityNum && trace2.entityNum != ENTITYNUM_NONE ) {
	Com_Printf("Trace mismatch: (world) %2d %f -> (ent) %2d %f\n",
		trace.entityNum, trace.fraction, trace2.entityNum, trace2.fraction );
}

if (!trace.startsolid && trace.entityNum != ENTITYNUM_WORLD && trace.entityNum != ENTITYNUM_NONE)
// yada yada
mint-arena: Move bot genetic selection into game VM
mint-arena: Move bot character file loading into game VM
mint-arena: Allow target_speaker to have have any sound extension

If no extension, default to .wav. Otherwise leave it be, it could be .ogg or .opus.
mint-arena: Make target_speaker without sound a soft error

Single player maps for SoF2, JK2, and JA often use some other key for sound.
Allow them to load anyway (assuming engine's been hacked up to load RBSP maps...).
Merge remote-tracking branch 'mint-arena/master'