Video capture VM

[zach-r-long]

Describe your feature
Add function to perform framebuffer capture of VM

Feature Details
Stage of Experiment when feature is active: (Creation, Start, Post Start, Running, Stop, Delete)
stage: 'Running'
Where should feature be visible (current phenix tab and general location or propose a new tab, or not visible)
view: 'VM Info Page and console'

Expected behavior
When activated all frame buffer updates will be written to a file, ability to start and stop at will.
This should also be callable from the command line