include letter Ø as common 0 lookalike

include letter Ø as common 0 lookalike

Programming fonts regularly use a slashed zero to distinguish the number,
but in some cases make it look very similar to the scandinavian vowel.
In low quality could even be mistaken for 8 shown subsequently.

Confusion with the symbols ∅ and ⌀ is less likely, usually having a
different shape, as do glyphs representing a dotted digit 0 (ʘ, ☉, ⊙, ⨀).