* Add nerdfont defs file and normalize vars

* some cleanup

* address feedback

* one more spacing issue

* address feedback

* Add support for Alexey Tourbin's QSORT code

See https://github.com/svpv/qsort

* Add benchmark scripts and compilation mode

Compile with `make O_BENCHMARK=1`, and run benchmarks with e.g.:
  ./misc/test/benchmark.sh ./nnn '/' '/usr/bin' '/usr/lib' > benchdata
You can then plot basic violin graphs with:
  ./misc/test/plot-bench.py benchdata

* Update style, doc, haiku support, fix lint

* Add icons

* Fix build break

* Fix icon position in detailed mode

* Various fixes

* Provision for icon specific colors

No icons with oldcolor. Small optimizatons

* Update Makefiles

Small refinement for other matching

Note that this is not compatible with 4 contexts.

* Add an option to print hovered files to a FIFO

This adds an env variable, `NNN_FIFO`, that can be set to a path that
`nnn` will open/create as a FIFO, and where every hovered file's path is
printed. This allows creating external perview/quick open plugins, ...

It can be compiled out with the make variable `O_NOFIFO`.

* Check filename ptr instead of full path (for FIFO)

* Add documentation to use NNN_FIFO in plugins

* Fix path sent to FIFO in empty dirs

This shows the "n³" logo as  icon in application menus, when desktop file is
installed (using `install-desktop` make target).

Install with `make install-desktop`
It now appears in application menus, search, etc. in XDG compatible
desktop environments (like GNOME, KDE, ...).

Command: make O_PCRE=1 strip

make command:

make O_STATIC=1 O_NORL=1 strip

* Add support for Haiku OS

* Adjust DISTFILES and dist rule in haiku

* Don't pack sources (github does it better), sign sources

* Make CircleCI generate the same git archive as Github, return make dist

* Revert make clean too

* Upload signature to Github release

* Read Github token from an env variable

Use only the `strip` target fort stripping the binary.

$(CP) is not set by GNU Make
Seems like [1] is a full list of what GNU Make defines implicitly
[1] https://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html