[IMP] Export Wizard New Look

hello,
I have improved design using bootstrap in export wizard, changed Export Wizard Dialogue box class to Widget class.

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
@vme-odoo  Done.! function replaced with template.