Add scrubstart & scrubend events. Version 5.22.0

VEX-266: Update current time & knob position as you scrub (#1)

* Update the current time & knob position as you scrub

* Update tests to pass lint checks

* Changes from doing an Ellation build of video.js

* Testing global mouse handlers for scrub bar

* Remove window import

* Global handling of mouse events in SeekBar now working

7.2.2

6.12.1

7.2.1

7.2.0

6.12.0

6.11.0

7.1.0

7.0.5