savyUI: Aggro Overlay 2.0.0

First standalone release of savyUI: Aggro Overlay for WoW Forever, previously included in savyUI 1.x.

• Requires savyUI 2.0.0. Other savyUI modules are not required.
• Includes a dedicated settings page.
• Retains existing module settings and data in savyUI's shared saved storage.

Close WoW before installing. When upgrading from the all-in-one savyUI, install the new main addon and desired modules, keep WTF/SavedVariables, and restart WoW.