New features

Initial release.

Changelog:

• #2720195: Add possiblity to retry mail sending
• #2735097: Customizable timeout

TLDR version: More UI goodness, batches galore, and cleaning up the watchdogs!

Initial release containing the ability to create Picture and Sizes type responsive images in one UI.

First version :)
Enjoy!

This one is the real 7.x release, like for reals. It's the same as dev, but this is stable enough for a release.