Features for early production readiness

[axic]

The items I mentioned being important for "early production readiness":

• ABI encoding/decoding for ADTs
• storage arrays
• abi_encode/abi_decode function usable within the language, this is frequently used by building data for signature checking (this likely already exists in some form)
• support for logs / emit (most of the scaffolding exists, see Supporting logs and events properly #447)
• encoding errors properly (similar work to logs)
• interaction with other contracts, i.e. an "interface" (trait/etc.) and calls to those functions
• public/private functions in contracts

I think after these it would be possible to accomplish most needs as a user.