This can be used to auto reload the input configuration file, e.g. in
vim:
autocmd BufWritePost ~/.config/mpv/input.conf silent !echo load-input-conf %:p | socat - /tmp/mpvsocket
Partially fixes#6362.
Additionally this can be used as a replacement for deprecated input
sections if they are ever actually removed. For example, if you want to
define different bindings for images, you can load-input-conf an
input.conf for images, and load the original again when switching to a
video. Though currently you would have to redefine builtin bindings that
were overwritten with image ones in the default input.conf.