## Description
Adds a `TransientButton` component for the types of button that are
shown on top of the video briefly during playback and reappear when
there is user activity. e.g. Unmute buttons, skip intro. It aims is to
be a generic button type to be extended. Some basic styles are provided
but kept light to not complicate customisation.
It's important to insert a transient button before the control bar for
the tab order to make sense.
_Optionally_ takes focus when shown.
## Specific Changes proposed
Adds `TransientButton` component.
## Requirements Checklist
- [x] Feature implemented / Bug fixed
- [ ] If necessary, more likely in a feature request than a bug fix
- [x] Change has been verified in an actual browser (Chrome, Firefox,
IE)
- [x] Unit Tests updated or fixed
- [ ] Docs/guides updated
- [x] Example:
https://deploy-preview-8629--videojs-preview.netlify.app/sandbox/transient-button.html
- [x] Has no DOM changes which impact accessiblilty or trigger warnings
(e.g. Chrome issues tab)
- [x] Has no changes to JSDoc which cause `npm run docs:api` to error
- [ ] Reviewed by Two Core Contributors
* remove duplicate icons from icon example
* create initial forward and back button classes
* add logic for back/forward buttons on click
* change icon used based on option passed into player
* move logic from forward and back buttons into one component
* add jsdoc comments for clarity
* create initial test file
* refactor button logic into separate files
* update skip button example and add test files
* test both the forward and backward buttons
* test handleClick fns for both forward and backward btns
* update skip buttons example
* update jsdocs for skip backward and forward buttons
* make control text accessible and use seekableEnd/Start when skipping forward/back
* update font version to use updated icons
* set control text only if config is valid
* add link to sandbox page & use localization
* update translations needed
Adds a debug build to video.js that does the following:
- Exposes DomData on video.js. DomData our internal event tracking object and should be empty on player dispose.
- Set log level to debug by default.
