Clear icon for mixin classes

[SHsuperCM]

Minecraft Development for IntelliJ plugin version

2023.3-1.7.5

Description of the feature request

It would be really useful if the classes in the project explorer were marked if they were mixins with a different icon. Preferably of a different color(like yellow as it seems to be the theme with mixins).

I believe that it will help navigating to mixins at a quick glance.
(ofc it could also be configurable to allow devs to not have the icons change)