Add the possibility to show threat status in the text colors and border

[RedAces]

What does this PR do?

Without this change you can only color the health bar with your threat status. e. g. red if you're a tank and dont have aggro on specific mob (-> dead DPS).
With this change you can now color the texts and borders if you like. Each target (health bar, texts, borders) can be enabled individually.

With this change you can see your threat status AND the mob type (like spellcaster, miniboss, ...) at the same time!

How was it tested?

Tested on 12.1 retail in a follower dungeon. No NPCs were harmed during testing.

Screenshots

Example: threat colors for the border and the texts were turned on, HP bar coloring was turned off. You see a mini boss that the tank (me) didnt taunt.

Note: Austin Huxworth survived this attempt.

Checklist

• New settings default OFF (no behavior change without opt-in)
• Zero cost while disabled: no events registered, no polling, no hooks doing work, no frames built
• Cheap while enabled: event-driven (no polling, no timer-based logic, no per-frame allocations)
• No writes onto Blizzard-owned frames (weak-table pattern used); HookScript/hooksecurefunc only, never SetScript on Blizzard frames
• Tested in-game on live; no version gates or pre-Midnight APIs added