Version 1.21.3

[fixed] broken Drop-Event handling
[fixed] Shader Thumbnail processing
[fixed] some minor bugs
[changed] Karma PDG for Shader Thumbnail processing (Tonemapping)
[changed/fixed] Shader Thumbnail PDG processing for better performance and stability (KarmaX, Mantra, Arnold, Renderman, Octane, Redshift, OpenGL)
[changed] OpenGL Thumbnail PDG processing to 3 slots for faster results (Model/Kitbashes)
[added] .lockassh file for blocking while Shader Thumbnail processing (for multi user working in the same library)
[added] auto. metadata (Houdini-/Renderer Version) for Shader presets
[added] Right-Click on Shader/Model(Kitbashes) thumbs -> “Delete Thumbnail”