Circuit pathfinding

An alternative to the standard pathfind function. Instead of pathfinding to a specific waypoint, it always goes towards the finish line waypoint, but also won't stop when it reaches it. It only stops when it travels a far enough distance.

This is basically a cleaner, less hacky, and optimized version of the pathfinding I gave to the bots; instead of doing 1-2 full pathfinds to do this (depending on if they are near the finish line or not), it will instead always do a single small pathfind. I also need it for shrink laser behavior.

src/k_bot.c

@@ -769,7 +769,7 @@ static botprediction_t *K_CreateBotPrediction(player_t *player)
 	distscaled = K_ScaleWPDistWithSlope(disttonext, angletonext, nextslope, P_MobjFlip(wp->mobj)) / FRACUNIT;
 
 	pathfindsuccess = K_PathfindThruCircuit(
-		wp, (unsigned)distanceleft,
+		player->nextwaypoint, (unsigned)distanceleft,
 		&pathtofinish,
 		useshortcuts, huntbackwards
 	);