Release 1.2.20

Release 1.2.20

Covers: 

* [BRIG-615] Added an API to allow custom resizing logic on the player
* [BRIG-680] Dupe of [BRIG-615]
* [BRIG-691] Ensure that the state of the CC popover is 
* [BRIG-762] Closed additional leaks in VMNConnection
* [BRIG-743] Added logging for HTTP events
* [BRIG-741] Show spinner when content loads, during buffering and when scrubbing. Ad spinner will be handled in [BRIG-548].