feat: OHIF-117 ohif extension default (#1712)

* initial structure for extension default

* webpack config

* split default modules into separated files

* bump versions

* update index

* update index

* fix

* Co-authored-by: Danny Brown <danny.ri.brown@gmail.com>

extensions/default/.webpack/webpack.dev.js

@@ -0,0 +1,8 @@
+const path = require('path');
+const webpackCommon = require('./../../../.webpack/webpack.commonjs.js');
+const SRC_DIR = path.join(__dirname, '../src');
+const DIST_DIR = path.join(__dirname, '../dist');
+
+module.exports = (env, argv) => {
+  return webpackCommon(env, argv, { SRC_DIR, DIST_DIR });
+};