Remove UI template engine

[darolmar]

Remove Apache Freemarker from the UI as user interactions enrichment and fast rendering are a must for our app and due to the fact that AngularJS is a robuts JS library. See the following links for further info:

• Client-side vs. server-side rendering: why it’s not all black and white

• Client-side rendering vs. server-side rendering

• The Benefits of Server Side Rendering Over Client Side Rendering

• Here’s Why Client-side Rendering Won

[darolmar]

See commits 305f7e4 and 316c4f1