[Feature Request] add option to include a custom hdri

[jGreenBytes]

My knowledge is generally limited in this manner, so I understand if this is not possible given certain resources.

As a user of vseeface (vtuber), I'd like to be able to change the lighting in various ways. This program already offers many different ways of doing this including AO, light source color, bloom, etc.

One additional way I'd like to affect lighting is via hdris. This would allow for more varied lighting options defined by real spaces.