Lightgallery

Add support for player.vimeo.com/video/<video_id>

- Add option to turn off hiding toolbar and controls
If `0` is passed via hideBarsDelay, lightGallery will not hide the toolbar and controls.

- new `supportLegacyBrowser` option
This helps make the usage of picturefill libray optional as all modern browsers support srcset attribute now
- Better error messaging
- Minor bug fixes

Fix issue - Horizontal and vertical flip buttons class names are interchanged

Add rotate module - https://github.com/sachinchoolur/lg-rotate.js

Features
* Rotate right.
* Rotate left.
* Flip horizontal.
* Flip vertical.

Remove unnecessary outline from the outer element.

Accessibility improvements