Add HSplits and VSplits to the CLI prompt

[dudash]

We want to show video and allow input so it doesn't get disrupted. This might require full screen mode.

Initial idea is this:

----------------------------------
|         Video           |      |
|                         | Chat |
|                         |      |
|                         |      |
|---------------------------------
|      Input and Status          |
|--------------------------------|

[dudash]

note - prompt-toolkit/python-prompt-toolkit#652