merde-v5.0.0

Added

• Introduce OwnedValueDeserialize
• [breaking] Introduce WithLifetime trait

Other

• Doc for externally-tagged enums
• Add doc in derive for tuple structs
• Add doc for enums & tuple structs
• done with tuple structs
• rejiggle order
• wip tuple structs
• Allow deriving for externally-tagged enums
• WIP enum support
• Require 'struct' prefix when deriving valuedeserialize etc.
• Introduce WithLifetime trait (thanks @JaSpa)
• Showcase 'impl is not general enough' problem