More case conversions

[otavioschwanck]

converting through different patterns of cases would be awesome, like:

convert to snake_case convert to camel case convert to js case (like camel, but with first letter downcased)

[the-mikedavis]

See https://github.com/helix-editor/helix/pull/4615, this can probably be covered by macro keybinds (#1383)

[otavioschwanck]

See #4615, this can probably be covered by macro keybinds (#1383)

i love the solution for #4615 , i think it is more interesting then binding commands to a macro.

[NomisIV]

The macro solution would be to create macros converting to and from each case, if I understand correctly. That would be 42 different macros and 42 different keybinds in total for converting between each casing. The key benefit of the proposed (original) solution in the #4615 PR is that seven different keybinds is enough, one for each target casing.