Add support for linting example scripts

package.json

@@ -53,6 +53,7 @@
     "dev-test": "concurrently --names \"ROLLUP,ROLLUPTEST,HTTP\" -c \"bgBlue.bold,bgRed.bold,bgGreen.bold\" \"rollup -c utils/build/rollup.config.js -w -m inline\" \"rollup -c test/rollup.unit.config.js -w -m inline\" \"http-server -p 8080\"",
     "start": "npm run dev",
     "lint": "eslint src --ext js --ext ts && tsc -p utils/build/tsconfig.lint.json",
+    "lint-examples": "eslint examples/jsm --ext js --ext ts --ignore-pattern libs && tsc -p utils/build/tsconfig-examples.lint.json",
     "test": "npm run build-test && qunit -r failonlyreporter test/unit/three.source.unit.js",
     "travis": "npm run lint && npm test"
   },

utils/build/tsconfig-examples.lint.json

@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "noEmit": true,
+  },
+  "include": [
+    "../../examples/jsm/**/*.ts"
+  ]
+}

utils/build/tsconfig.lint.json

@@ -3,6 +3,6 @@
     "noEmit": true,
   },
   "include": [
-    "../../**/*.ts"
+    "../../src/**/*.ts"
   ]
 }