Create Marker command variable

(marker=) variable that will create a marker when the command is used.
Optional parameter for marker title.

Example use cases:
!death, creates a marker each time you’ve died
!hype, creates a marker for when someone raids

We do not support Helix and no plans to at this time as Twitch has not provided a timeline for completion. This is something that was already considered when Helix is ready.