Add various text-oriented wrapper libraries.

[sigilante]

Add alternative functions for common text conversion operations.

[will-hanlen]

could the second half of this be simplified by using +slavs instead of +slaws?

++  text-to-ship  (cury slav %p)

or is there some advantage to using the unitized version?

[sigilante]

Per conversation with @belisarius222 ~2024.5.23, I have collected all of the strictly text-related libraries into one PR. These are explicitly NOT kelvin-versioned, and consist of wrappers, aliases, and simple helper functionality.

@tinnus-napbus generating documentation should be straightforward as all of the functions are documented in each file, including examples.

[sigilante]

I guess /lib/bits is not technically part of this scope.

[jalehman]

Deadline for review is tomorrow, at which point if there are no comments we'll go ahead and merge.

[tinnus-napbus]

I have opened PR #7020 with optimisations for some of the functions in libstring & fixed a couple of functions that were incorrect (right-find, right-justify and arguably split which wasn't adding an empty string after a trailing separator).

I will look at the other 2 quickly tomorrow. Sorry for not getting around to it earlier

[tinnus-napbus]

ok I have opened PR #7021 with some changes to the other 2 libs (see PR for details) - not sure if you want the utf changes I made