[IMP] Export Wizard New Look

hello,
I have improved design using bootstrap in export wizard, changed Export Wizard Dialogue box class to Widget class, added sorting functionality for Fields to Export column, remove fields from column "Fields to Export", all on selecting All Data and only non-compatible fields on selecting Import-Compatible Export.

More Details:
Task: https://www.odoo.com/web#id=8651&view_type=form&model=project.task&menu_id=3942&action=327
Pad: https://pad.odoo.com/p/r.mpua9w4G7VMVj4tD

thanks
rba-odoo
Why rewriting code to get_fields, you can simply trigger click, click will do the job