feat: add infer and tree_magic_mini meta plugins, make zstd internal by default

- Add infer crate as meta plugin for MIME type detection
- Add tree_magic_mini crate as alternative meta plugin for MIME type detection
- Add zstd, infer, tree_magic_mini to default features
- Fix static build script to use musl target instead of glibc+crt-static
- Remove hardcoded shell list from --generate-completion help text
- Fix update() in both new plugins to emit MIME metadata when buffer fills

src/lib.rs

@@ -71,6 +71,14 @@ use crate::meta_plugin::magic_file;
 #[allow(unused_imports)]
 use crate::meta_plugin::tokens;
 
+#[cfg(feature = "infer")]
+#[allow(unused_imports)]
+use crate::meta_plugin::infer_plugin;
+
+#[cfg(feature = "tree_magic_mini")]
+#[allow(unused_imports)]
+use crate::meta_plugin::tree_magic_mini;
+
 /// Initializes plugins at library load time.
 ///
 /// Plugin registration happens automatically via `#[ctor]` constructors