Rust is good, why not incorporate some design?

This is a proof-of-concept library for myself.

Under include/rusty-cpp/impl,

• primitive_types.hpp: Some primitive type aliases and literals.
• endian.hpp: Some endian-related conversion utilities.
• maybe_uninit.hpp: The counterpart of MaybeUninit in Rust. Not recommended.
• deferred_init.hpp: A less flexible version of rc::MaybeUninit. Recommended.
• dbg_macro.hpp: The counterpart of dbg! in Rust.