Consider optional tie-in with focus unit

[Sharparam]

(Suggested in WoWAce comment)

An option could potentially be added to make the health frame tie-in with the focus unit to enable targeting and other unit actions on the BGH frame.

Things to consider...

• [ ] Is it at all possible?
• [ ] Simple enough to implement as a toggle option?

[Sharparam]

Not implementing, current way with the macro functionality for targeting is better and provides the same feature.