Add new base object stuff, gc dependency

I'm not writing my own GC, it's a huge pain in Rust. I'm using the gc
library instead.

Base object stuff implementation is here too. Hopefully going to start
using ObjPtr instead of Value next.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

Cargo.toml

@@ -9,4 +9,5 @@ edition = "2021"
 thiserror = "1.0"
 structopt = "0.3"
 regex = "1.5"
-lazy_static = "1.4"
+lazy_static = "1.4"
+gc = { version = "0.4", features = ["derive"] }