argv: add several hidden flags
argv: add several hidden flags

This adds hidden counter-flags for the following:

  -L/--follow [--no-follow]
  --hidden [--no-hidden]
  --no-ignore [--ignore]
  --no-ignore-parent [--ignore-parent]
  --no-ignore-vcs [--ignore-vcs]
  --no-messages [--messages]
  --search-zip [--no-search-zip]
  --sort-files [--no-sort-files]
  --text [--no-text]

In the above list, the counter-flags are in brackets.

While these flags are hidden, we document the counter-flags in the
documentation for the flags they are countering.

BurntSushi/ripgrep,BurntSushi/ripgrep,BurntSushi/ripgrep,BurntSushi/ripgrep