Custom video resolution

[garymooney]

Videos are generated at a default 1080p. Allow the ability to generate other resolutions.

Common 16x9 resolutions:
144p -> 256x144
240p -> 426x240
360p -> 640x360
480p -> 854x480
720p -> 1280x720
1080p -> 1920x1080
1440p -> 2560x1440
2160p -> 3840x2160

Allow users to input the resolution to the generate_qmuvi method as a string containing the name of the resolution. E.g. "1280x1080". The string determines the width and height of the video. Also allow the input of common 16:9 names ending in 'p' for ease of use. E.g. "360p" is shothand for "640x360". Include a brief description of these common options in the python docstring.

Note: Due to size limitations in qiskit's matplotlib circuit drawer, the outputted circuit images are a set resolution. They are currently downscaled for the 1080p video, however will need to be upscaled for the larger output resolutions.