add prettier config + vscode formatter

package.json

@@ -28,6 +28,7 @@
   "devDependencies": {
     "@types/lodash": "^3.10.1",
     "@types/screeps": "^2.4.0",
+    "prettier": "^1.14.0",
     "rollup": "^0.57.1",
     "rollup-plugin-clear": "^2.0.7",
     "rollup-plugin-commonjs": "^9.1.4",
@@ -35,6 +36,8 @@
     "rollup-plugin-screeps": "^0.1.2",
     "rollup-plugin-typescript2": "^0.16.1",
     "tslint": "^5.9.1",
+    "tslint-config-prettier": "^1.14.0",
+    "tslint-plugin-prettier": "^1.3.0",
     "typescript": "^2.9.2"
   },
   "dependencies": {