Assimp-based model import and the MonkeyWrench library

The Assimp v6 changes I mentioned back in May will soon trickle down into MonkeyWrench. It appears likely the next release of jme3-lwjgl3 will be based on LWJGL v3.4.1 or perhaps later. LWJGL v3.4.1 incorporates all changes to Assimp through 29 January 2026 (Git hash 18798f1), including everything in Assimp v6.0.4 plus 2 subsequent commits. Among other things, Assimp v6 introduced some new semantic-type codes for textures, including one for glTF metallic-roughness textures. That change means MonkeyWrench v1.0.0 won’t import glTF models properly when running on jme3-lwjgl3 v3.10.0-alpha3 or later. I’ve begun work on this issue. When JME v3.10 is stable, I’ll publish a new release of MonkeyWrench to accompany it.