Rename src/ModifyTable.jl to src/GenericCharacter.jl or src/CharacterType.jl

[fingolfin]

... or something like that: almost all function left in it are dealing with generic characters as input.

The one exception is specclassparam!. But I think that should perhaps be moved to src/Deprecations.jl ? Perhaps we first need a replacement, though, in that case might retain ModifyTable.jl a bit longer and "just" move 95% of its content to another file.

This new file for generic characters / character types then could also be the home for function added in PR #157 and possibly some others which currently reside in Show.jl

(We might also wish to split this new file into multiple ones later, dunno, we'll make it up as we go, I guess)

[SoongNoonien]

Yeah, good idea.

The one exception is specclassparam!. But I think that should perhaps be moved to src/Deprecations.jl? Perhaps we first need a replacement, though,...

We need a better way to deal with the class types in general. Maybe we could add a class type type (of course with a better name). A new object of this type could be created on demand out of the tables data. Ideally without copying too much data.

[fingolfin]

Having a "class type" (or "generic class" ???) type might indeed be a good idea, but the details are unclear ... e.g. how would these interact with "generic characters"