Migrate the timers that manage creating timeupdate and progress events when the tech doesn't support them natively. Now, techs that extend MediaTechController will continue to automatically pick up synthetic playback and buffering events but they're scoped much more closely to the entity that needs them. In addition, time and progress tracking have been moved much earlier into the component initialization which fixes#1414.
patchCanPlayType is called on load.
It patched video#canPlayType if needed.
unpatchCanPlayType will revert the patch and return the patch function.
There are also corresponding tests that test patchCanPlayType,
unpatchCanPlayType and also whether the patch functions themselves work
correctly.
If you are quick, you could get videojs to wrap the HTML video element twice on iOS. The video element has to be recreated after moving on iOS but we weren't re-associating it with the player object. When autoSetup swung through, it would re-initialize the video element and create a player within a player.
Hide volume slider and mute toggle when the current tech doesn't support adjusting video volume. Added controls specific test cases. Volume-related controls retest whether to display themselves whenever `loadstart` fires.
