AddOn loaded load condition

[Causese]

Is your feature request related to a problem? Please describe.
Sometimes WAs have certain textures that are part of an AddOn and it only makes sense for it to be loaded if you have the AddOn.

Describe the solution you'd like
a simple "IsAddonLoaded" load condition

Describe alternatives you've considered
custom trigger that checks if addon is loaded, not ideal since it still affects performance.

Additional context
Add any other context or screenshots about the feature request here.