## Link to GitHub Issue or related Pull Request, if one exists
#0
## Description of change
MSE method of streaming video needs the dimensions up front. This new
api delivers that. Also provides an easier way to determine which
screens are available and a way to discover port number.
## Testing
See pending changes in substream project
## Link to GitHub Issue, if one exists
n/a
## Description of change
Allow the server to override client's quality options for screen
mirroring.
On Windows / Android versions (flutter-based) clients, this is already
in the options of those apps. However, the iOS version lacks the quality
options.
## Testing
Tested with iOS and Windows clients.
bicarus