Make default materials accessible to users about cesium-unity HOT 3 OPEN

Apparently Unity hides packages that are "imported in an immutable way." Toggling package visibility affects other packages than Cesium for Unity -- for example, "Input System" and "TextMesh Pro." Maybe that's the reason why "TextMesh Pro" prompts users to import the assets, so that they're not hidden from the assets menu.

I looked around the PackageManager API to see if we could make it visible despite being immutable. It seems like local and embedded packages are visible without needing to click the eye icon, embedded meaning that the package is explicitly stored in the project folder and in a custom state.) where, perhaps, the user could make changes. But it may be too much trouble (and also undesired) to embed the package in the user's project.

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Would it be a good idea to have a button on the tileset that can generate a custom material (really just clones the default material) and puts it in the user's Assets folder? The new material would automatically be set as the override material for the tileset. We don't really want users to directly manipulate plugin assets anyways - that might cause issues during plugin upgrades, for instance.

In the future, we could make this button do more than just cloning the material - instead it might auto-generate a shadergraph based on a user-defined list of features (metadata properties, transparency, watermask, etc.).

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They do show up if you click the little eye icon. Not sure what we can do to make them show up all the time.

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