Export plane type field, to allow optimizations for axis-aligned planes

main.cpp

@@ -411,7 +411,8 @@ int process_faces(const world_t* world)
 
 		ps1bsp_plane_t outPlane = { 0 };
 		outPlane.normal = convertNormal(plane->normal);
-		outPlane.dist = (int)(plane->dist * 4);
+		outPlane.dist = (short)(plane->dist * 4);
+		outPlane.type = (short)plane->type;
 
 		outPlanes.push_back(outPlane);
 	}

ps1bsp.h

@@ -85,7 +85,8 @@ typedef struct
 typedef struct
 {
 	SVECTOR normal;
-	int dist;
+	short dist;
+	short type;
 } ps1bsp_plane_t;
 
 typedef struct