Add setting to forbid the usage of pathfinding

src/pathfinding.js

@@ -1,8 +1,15 @@
 import {getCenterFromGridPositionObj} from "./foundry_fixes.js";
+import {settingsKey} from "./settings.js";
 
 // TODO Wipe cache if walls layer is being modified
 let cached_nodes = undefined;
 
+export function is_pathfinding_enabled() {
+	if (!game.settings.get(settingsKey, "allowPathfinding"))
+		return false;
+	return game.settings.get(settingsKey, "autoPathfinding") != game.keyboard.isDown("y")
+}
+
 function get_node(pos, initialize=true) {
 	if (!cached_nodes)
 		// TODO Check if ceil is the right thing to do here