Implement Forth language

[kamil-adam]

Resources:

• https://esolangs.org/wiki/Forth
• https://exercism.io/tracks/haskell/exercises/forth/solutions
• https://ouromoros.github.io/english/2018/03/13/writing-a-simple-evaluator-for-forth-in-haskell-part1/
• https://glitchbra.in/post/write-a-forth-in-haskell-intro/

Implementations:

• https://github.com/helvm/embed - embed: A tiny embeddable Forth interpreter - in Forth and C
• https://github.com/helvm/forth - in Haskell and Forth
• https://github.com/helvm/miniforth - in Haskell
• https://github.com/helvm/array-forth - F18A Emulator - in Haskell
• https://github.com/helvm/hforth
• https://github.com/helvm/harrorth

Subtasks:

• https://github.com/helvm/helpa/issues/18
• Add while and rewrite all eso examples
• WhiteForth for WS
• InlineForth for WS, ETA, BF, Piet, Funge
• CPSForth (Continuation-passing style Forth)

Required:

• https://github.com/helvm/helpa/issues/2
• https://github.com/helvm/helpa/issues/18