Missing UI option for making textures readable

[edwardbrowncross]

Describe the bug
In release 6.8.0, a field was added to the ImportSettings class to create textures that are readable from scripts. No corresponding checkbox was added to the UI panel to allow you to enable this for files imported at design time.

To Reproduce
Steps to reproduce the behavior:

1. Import any gltf file into Assets
2. Click on it in the assets panel
3. Note the lack of option in the inspector

Expected behavior
An option like this:

Desktop:

• glTFast version: 6.8.0
• Unity Editor version 2021.3.21
• Platform: Editor

Additional context

Editor/Scripts/ImportSettingsEditor.cs

Add (~Line 36):

serializedObject.FindProperty($"{pathPrefix}texturesReadable"),