Support multiple VSPro biomes/vegetation packages

VSPro is one of the most popular (and performant) ways to render vegetation in Unity. One of its key concepts are biomes and vegetation packages, which make it much easier to organize vegetation assets in larger projects. Unfortunately, the VSPro integration currently only supports a single vegetation package. This means that, in order to use MapMagic with VSPro, all vegetation assets (and vegetation masks) would need to go into a single huge vegetation package that is very cumbersome to work with.
Supporting multiple VSPro packages would be extremely helpful and vastly improve the workflow for using MapMagic with VSPro.