Add support for embedding resources in the rust generator

This is relatively straight-forward via a pass in the compiler to
collect the resources to embed and then use include_bytes! (once per
resource).

What's really annoying is that the rust resource enum can't store a
&'static [u8] because cbindgen doesn't represent that, probably because
the slice representation isn't guaranteed to stay as it is. So instead
this, for now, uses raw pointers.

tools/compiler/main.rs

@@ -15,7 +15,8 @@ fn main() -> std::io::Result<()> {
     //println!("{:#?}", syntax_node);
     let mut tr = typeregister::TypeRegister::builtin();
     let doc = object_tree::Document::from_node(syntax_node, &mut diag, &mut tr);
-    run_passes(&doc, &mut diag, &mut tr);
+    let compiler_config = CompilerConfiguration::default();
+    run_passes(&doc, &mut diag, &mut tr, &compiler_config);
 
     let (mut diag, source) = diag.check_and_exit_on_error(source);