Reload integration data changes from uhuu editor

Guvener
@guvener
Timon
@timon
Patrick
@patrick

When data changes on remote data source, now you can request integration reload directly from uhuu editor.
Split loading indicator between saving and exporting so that user can save again while waiting for export.

More updates:
  • Assets delivered through cloudfront, faster team settings and print store dashboard.
  • Check webp support on thumb generation headers and deliver optimied template images accordingly.
  • Advance Payment introduced as store option.
  • Advance Payment routes for checking out with prepayment.