Car and pathfinding implementation setup

src/infrastructure_helpers.odin

@@ -95,4 +95,9 @@ delete_entity :: proc(self: ^Simulator, entity_index: u32, type: common.Entity)
 	}
 	
 	return {}, false
+}
+
+// Returns a random node that has no cars on it
+get_free_node :: proc(self: ^Simulator) -> u32 {
+	
 }