derive_custom_enum_traits

This is a set of (currently one) derive macros for Rust for dealing with enums. Its current macro, DeriveIndex creates two functions for an enum, to_index, which converts an enum variant into its 0-indexed order; and from_index which converts a usize into an Option<Variant>.

lib.rs:

derive_custom_enum_traits serves as a collection of (currently one) derivable macros for dealing with enums.