Write GLB

/**
 * Node that exports a mesh to GLB (binary glTF) file format.
 * 
 * Saves mesh data to an external GLB file for use in
 * web applications and other 3D tools.
 * 
 * Usage:
 * 1. Connect mesh to export
 * 2. Set output file name
 * 3. Click Apply to write file
 */