• engine: add a linearFog material parameter. [⚠️ New Material Version]
• opengl: When Material::compile() is called on a platform which doesn't support parallel compilation, shaders are automatically compiled over a number of frames
• engine: Added useDefaultDepthVariant material parameter to force Filament to use its default variant for
  depth-only passes. [Requires recompiling materials]
• material: fix specularFactor in LOW_QUALITY mode. [Requires recompiling materials] to take effect.
• material: Add CRC32 validation for material packages [⚠️ New Material Version]
• material: Improve LineDictionary compression [⚠️ New Material Version]
• Filament is now targeting c++20 (was previously c++17)