Show Me What This Is (SMWTI)

Adds NeoForge builds and Forge 1.20.1 and NeoForge 1.20.1, so SMWTI now comes for Forge and NeoForge on 26.1.2, 1.21.1 and 1.20.1. Every build was run in a client and checked on a block, an entity, a fluid and a dropped item.

- Dropped items now show in the overlay (name, enchantments, attack lines); the game never lets the crosshair pick them, so SMWTI looks for them along the look ray. Item frames show their item's enchantments too.
- The block id, block state and entity id lines are readable now (they were dark gray on the dark panel and the colon in `minecraft:stone` disappeared).
- A line position this version does not know (from a mod built for a newer SMWTI) falls back to the body instead of breaking the whole reply.
- NeoForge 1.21.1: the fluid name now comes from the supported call.
- Unit tests for the line codec and the tooltip API.