tslint: Enable prefer-for-of

This is not a big deal, but I think it makes the code a bit nicer.

src/backend/mi_parse.ts

@@ -93,8 +93,7 @@ export class MINode implements MIInfo {
 				path = path.substr(target[0].length);
 				if (current.length && typeof current != "string") {
 					const found = [];
-					for (let i = 0; i < current.length; i++) {
-						const element = current[i];
+					for (const element of current) {
 						if (element[0] == target[1]) {
 							found.push(element[1]);
 						}

tslint.json

@@ -32,7 +32,6 @@
 		"one-variable-per-declaration": false,
 		"only-arrow-functions": false,
 		"ordered-imports": false,
-		"prefer-for-of": false,
 		"quotemark": false,
 		"radix": false,
 		"semicolon": false,