[bugfix] Fix Vault font/icon coloring & Character Screen fonts

[lolswirl]

What does this PR do?

Applies global/module settings to Character Sheet and Great Vault window skins
Also fixes the coloration of the default "white" on the icon borders of great vault items to their rarity

How was it tested?

Live on 12.1.0.69497

Screenshots

Settings:

Character Sheet

Before:

After:

Great Vault

Before:

After:

Different settings

Settings:

item coloration fix:

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

[EllesmereGaming]

added the color fix for great vault items but the rest is a bit more complex that I need some more time to work on