[FIX] base: compile correctly on windows

Fix package.json and tsconfig.json to build correctly on windows:
the extention scr/* doesn't expand on windows, so I removed it.

Added a precompilation step on npm run extras:watch

package.json

@@ -4,7 +4,7 @@
   "description": "Odoo Web Library (OWL)",
   "main": "src/index.ts",
   "scripts": {
-    "build:js": "tsc --target esnext --module es6 --outDir dist/owl src/*",
+    "build:js": "tsc --target esnext --module es6 --outDir dist/owl",
     "build:bundle": "rollup -c",
     "build": "npm run build:js && npm run build:bundle",
     "minify": "uglifyjs dist/owl.js -o dist/owl.min.js --compress --mangle",
@@ -12,6 +12,7 @@
     "test:watch": "jest --watch",
     "extras:serve": "python3 extras/server.py || python extras/server.py",
     "extras": "npm run build && npm run extras:serve",
+    "preextras:watch": "npm run build",
     "extras:watch": "npm-run-all  --parallel extras:serve \"build:* -- --watch\""
   },
   "repository": {

tsconfig.json

@@ -16,5 +16,5 @@
     "strictPropertyInitialization": true,
     "strictNullChecks": true
   },
-  "include": ["demo/static/**/*.ts", "src/*.ts", "tests/*.ts"]
+  "include": ["src/*.ts"]
 }