Fix TSLint issues

As this is the starter project it should be provided without any errors.
This commit restructures some code to solve the TSLint issues.

src/main.ts

@@ -2,11 +2,11 @@ import { ErrorMapper } from "utils/ErrorMapper";
 
 // When compiling TS to JS and bundling with rollup, the line numbers and file names in error messages change
 // This utility uses source maps to get the line numbers and file names of the original, TS source code
-export const loop = ErrorMapper.wrapLoop(function() {
+export const loop = ErrorMapper.wrapLoop(() => {
   console.log(`Current game tick is ${Game.time}`);
 
   // Automatically delete memory of missing creeps
-  for (let name in Memory.creeps) {
+  for (const name in Memory.creeps) {
     if (!(name in Game.creeps)) {
       delete Memory.creeps[name];
     }