Improve performance single compressed script & stylesheet

[aurovrata]

Improve performance with a single compressed script file and a single compressed stylesheet file for a given form

Currently a form can have multiple script libraries and stylesheet loaded separately including custom js/css. This causes multiple requests on the server for a single form page load.

The required scripts/stylesheets are already determined when a form is saved in the backend. It would be rather straightforward to compile a single compressed script file and stylesheet combining all the required libraries so as to reduce the server requests to 2 files per form.