Initial reorg.

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

crates/misc/rust/macro/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "wasmtime-rust-macro"
+version = "0.2.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+edition = "2018"
+license = "Apache-2.0 WITH LLVM-exception"
+description = "Macro support crate for wasmtime-rust"
+
+[lib]
+proc-macro = true
+test = false
+doctest = false
+
+[dependencies]
+proc-macro2 = "1.0"
+quote = "1.0"
+syn = { version = "1.0", features = ['full'] }