feat(imaging): default to pure-Rust codecs

programs/tests/test_client_world_cli.rs

@@ -1,4 +1,6 @@
-use libremetaverse_imaging::{J2kCodec, J2kEncodeOptions, ManagedImage, ManagedImageImageChannels};
+use libremetaverse_imaging::{
+    J2kEncodeOptions, ManagedImage, ManagedImageImageChannels, RustJ2kCodec,
+};
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Output, Stdio};
@@ -85,7 +87,7 @@ fn one_pixel_jp2() -> Vec<u8> {
     image.red[0] = 10;
     image.green[0] = 20;
     image.blue[0] = 30;
-    J2kCodec::encode(&image, J2kEncodeOptions::default()).expect("encode JPEG2000")
+    RustJ2kCodec::encode(&image, J2kEncodeOptions::default()).expect("encode JPEG2000")
 }
 
 #[test]