jMonkeyEngine 3.2.3-stable

A 3.2 patch release with various fixes since 3.2.2:

• issue #1003 (loading multiple GLB files)
• pull request #839 (add texture formats R16F, R32F, RG16F, and RG32F)
• pull request #980 (onJoyButtonEvent() called on every update)
• issue #1029 (sphere-sphere collisions not reported in native Bullet)
• pull request #1012 (fix Node.depthFirstTraversal() with DFSMode.PRE_ORDER)
• issue #981 (update Nifty version to 1.4.3)
• pull request #974 (update LWJGL3 version to 3.2.1)
• issue #997 (cloning UpdateControl throws IllegalArgumentException)
• issue #1004 (RagdollUtils can't handle 16-bit bone indices)
• issue #1027 (return type of PhysicsSpace.rayTest() and rayTestRaw())
• many jme3-examples issues:
  • issue #982 (TestManyLocators crashes)
  • issue #983 (TestMusicStreaming crashes due to missing asset)
  • issue #985 (TestAssetLinkNode throws AssetLoadException)
  • issue #988 (assertion failure in CubeField)
  • issue #992 (HelloCollision throws AssetLoadException)
  • issue #993 (TestGltfLoading throws AssetNotFoundException)
  • issue #994 (wildhouse.zip not found)
  • issue #998 (TerrainGridTest throws AssetLoadException)
  • issue #1026 (TestPhysicsCharacter spins Sinbad too fast)
• AND numerous new tests and improvements to the JavaDoc, diagnostic messages, and imports.