* Add plugin bulknew

* Update documentation

* Update dependencies

* Add whitespace note

Both Pistol and `scope.sh` are run `file --mimetype` or an equivalent, internally.
Thus, for speed, it's better to run them before almost anything else.

* Easier to browse plugin README.md

* Splits are inverted

* trying to fix kitty splits

* Correctly restores the kitty layout

* More clear comments

* Easier to browse plugin README.md

* Splits are inverted

* $SPLIT clarification and default values for $SPLIT and $TERMINAL

* Unified preview-tui and preview-kitty

* Remove preview-kitty

* No need to set $TERMINAL

* fix undeclared variable

* Integrated support for scope.sh

* Review fixes

* allow_remote_control must be enabled on kitty

* Documentation, kitty splits and images fallback

* fix restoring kitty layout

* preview-tui: simplify, add generic fifo_pager()

I've commented new filetype checks for now, as we need to discuss which ones
should be included by default, keeping in mind that this is supposed to be a
minimal, adaptable plugin.

* preview-tui: preview with man, tar, unzip by default

As reported by @toddyamakawa

Uses `NNN_FIFO`, minimal dependencies.

Co-authored-by: Todd Yamakawa <todd.yamakawa@arm.com>

Co-authored-by: Todd Yamakawa <todd.yamakawa@arm.com>