Spelling correction of Zencode

[jaromil]

Having a restricted range of words and even a reduced amount of combination in their proximity gives us the possibility to develop a spelling corrector as low-hanging fruit.

Here some theory http://norvig.com/spell-correct.html

Novig's spelling corrector is already implemented in Lua: https://github.com/pakozm/lua-spell-correct

It suffices to have a bit of adaptation from this and a small dictionary based on Zencode...