vim-patch:56033b9: runtime(sh): Fix some ksh-specific deficiencies in syntax script

- Amend syntax highlighting to allow for ksh93 discipline function names
  (e.g. 'foo.get()') and mksh's odd function naming idiosyncrasies
  (shNamespaceOne was introduced to enforce stricter naming rules for
  ksh93 namespaces).
- Remove 'bind' from ksh93 syntax (such a builtin has never been
  implemented in ksh93).
- 'xgrep' is only available in ksh93v- as an alternative way to
  invoke the builtin 'grep -X', so reflect that in the syntax
  highlighting.
- Forbid bash-style 'function name() {' syntax when highlighting
  ksh88 and ksh93 scripts.
- Fix bug causing ' ()' to be incorrectly validated in mksh scripts.
- Add the many ksh93/ksh2020 .sh.* variables to the list of special
  variables.
- Amend iskeyword to allow '.' so that '.sh.tilde.get' and such are
  valid function names/variable names. (For mksh functions starting
  with odd characters like '%' and '@' this would probably have too
  many bad side effects, so I've omitted such a change for that shell.)
- Add new syntax tests and regenerate syntax dump files

closes: vim/vim#19383

https://github.com/vim/vim/commit/56033b9df3ef56d8e37b7927521baf621fd88ab7

Co-authored-by: Johnothan King <johnothanking@protonmail.com>

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