Initial reorg.

This is largely the same as #305, but updated for the current tree.

crates/wasi-c/src/lib.rs

@@ -0,0 +1,12 @@
+#[macro_use]
+extern crate log;
+extern crate alloc;
+extern crate core;
+
+mod host;
+mod instantiate;
+mod syscalls;
+mod translate;
+mod wasm32;
+
+pub use instantiate::instantiate_wasi_c;