sceneform-1.9pr4

This release of Filament is a check point release towards Sceneform 1.9.

List of relevant changes since sceneform-1.9pr3:

⚠️ this version breaks compiled materials, use matc to recompile
⚠️ this version breaks IBL cubemaps, use cmgen to recreate them

Enhancements

Engine

• Added gltf_bloom Android sample to show gltfio and the RenderTarget API.
• Added getMaterialInstanceAt to the Java version of RenderableManager.
• Fix JNI bindings for setting values in parameter arrays.
• Added JNI bindings for the gltfio library.
• Added support for RGB_11_11_10
• Removed support for RGBM (:warning: source compatibility breakage)
• IBL cubemap can now be of any size
• Texture::generatePrefilterMipmap can be used for runtime generation of a reflection cubemap

Tools

• Fix support for parameter arrays in .mat files.