Error handling improvements

[piegamesde]

• Fixes various bugs related to error handling
• Adds a lot of error handling conditions, including message deserialization failure (Closes #97)
• Moved to custom error types with thiserror for the library
• Moved to eyre instead of anyhow for the binaries
• Also added sane Display implementations for a lot of types so the log is a lot more helpful for debugging errors.

This is a good step towards #125, but not all points have been addressed yet.