wip: move macro lib out of proc macro crate

packages/macro-inner/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "dioxus-macro-inner"
+version = "0.0.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+once_cell = "1.8"
+proc-macro-error = "1.0.4"
+proc-macro2 = { version = "1.0.6" }
+quote = "1.0"
+syn = { version = "1.0.11", features = ["full", "extra-traits"] }