Run all dhall-lang tests for normalization

Pass all import tests

Allow self-describing CBOR

Environment variable failure can fallback

Allow imports to be either binary or source form

Tests are in UTF-8

Update to latest dhall-lang

Add cache_key test runner

Update to new UnionType selection semantics

Anything we'll eventually run is a skip

Fix env import decode

Fix test to new binary format

No more null fragment

Use upstreamed type tests

Refactor parser based on nicer ABNF

Rebuild parser if any input changes

Fix rubocop except for parser metrics

Working parser

Keep around type information when we have it

Simplify binary tests for now

fix type => [value|element]_type