jMonkeyEngine: jMonkeyEngine 3.9.0-alpha5

From jMonkeyEngine: link to the original post

What's Changed

• Refactor: PointLightShadowRenderer reduce object allocations by @capdevon in #2514
• Refactor: BinaryExporter optimization + javadoc by @capdevon in #2524
• Refactor: NewtonianParticleInfluencer reduce object allocations by @capdevon in #2506
• Android 16kb openalsoft update by @joliver82 in #2552
• #2562 thread warden by @richardTingle in #2563
• Refactor RenderManager for improved Type Safety, javadoc, and code clarity by @capdevon in #2530
• Added convenience method worldToLocal(Quaternion) to spatial. by @zzuegg in #2559

Full Changelog: v3.9.0-alpha4...v3.9.0-alpha5