Standardize trait implentation on error types

[DavidLeeds]

Standardizing error types with the following traits will help them integrate more smoothly with application error handling:

1. Clone
2. Debug
3. Error
4. PartialEq
5. Eq

Errors include:

rasn/src/error/decode.rs

Line 138 in d97c44d

pub struct DecodeError {

rasn/src/error/encode.rs

Line 104 in d97c44d

pub struct EncodeError {

Note: need to gate Error implementation on "std" feature.

[XAMPPRocky]

Thank you for your issue! This sounds like a good idea.

Note: need to gate Error implementation on "std" feature.

I don't think that's true anymore.

https://doc.rust-lang.org/stable/core/error/trait.Error.html