Restore video tag attributes on tech change

New attempt to fix this issue #1367 related to the webkit-playsinline attribute missing.
business logic on getAttributeValues : knownBooleans = ','+'autoplay,controls,loop,muted,default'+',';

setElementAttributes is 'html oriented', you have a dom element you want to update the attributes according to a dict. Nothing related to videojs.
BTW I already changed it but  can revert the change and if we keep this change  I should put the set and get methods on the same place, now the setElementAttributes is near the createEl