Fade-to-black: static state (blackout vs program out)

`getFadeToBlackState() ` returns whether the Fade-to-black operation is currently in progress, but not whether the program out is active or blacked out.

This pull request adds the missing information.

> Note: I use the ATEM library in a modified and ported version for ARM cpus and backported these FTB changes. So unfortunately I have no way to compile the changes in an Arduino environment, but the change itself works well for a couple of month already (with an ATEM 1 M/E).