Auto observer fixes, preferences, and QoL

[morrowwolf]

About the pull request

This PR creates wrappers for screen additions and removals to allow for a creation of a signal observers can then register to so the observed screen changes are all changed on any observer's screen as well.

Let me be very clear: this needs a lot of testing and I did this kind of ad hoc just to see if it would work. Brief testing seems to show it working but I expect there are oversights and problems. More than likely I am recreating the wheel in some way and doing it the dumb way.

Explain why it's good for the game

Making the HUD observer more accurate is cool.

Testing Photographs and Procedure

Screenshots & Videos

Put screenshots and videos here with an empty line between the screenshots and the <details> tags.

Changelog

🆑 Morrow
add: Added a save-able preference for auto-observe
fix: Fixed numerous problems with HUD observer mode
code: Created a wrapper for client screen changes
code: Made check contents less horrendous
/:cl:

[morrowwolf]

Gotta probably store the client somewhere in case they ghost, same with qdel as it wasn't clearing the registered signal