Wishlist
* 4xE HV battery charge level

Todo:
* More tests, especially the in-Jeep kind
* Better utilities to reverse engineer Jeep CAN frames

Polish:
* `std::fmt::UpperHex` and `Binary` implementations for various events.
* More rustdoc examples for items
* Figure out which enums should be [bitflags](https://rust-lang.github.io/api-guidelines/type-safety.html#c-bitflag)
