Resolution selector

[sirknightj]

Issue #, if available:

• N/A

Description of changes:

• Add a configuration option to change the resolution of the camera.
• Previously, it would always choose the largest resolution (3088x2320 on the iPhone SE 2nd Gen)

Here is what the UI looks like:

Testing

• Manually checked the other side receives the appropriately sized video.
• Clicked the different resolutions and it gets updated.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[YPandas]

Looks ok to me.