Problem: filetype: SPA (single page application) JSON files are not
recognized (used by pipewire and wireplumber)
Solution: detect pipewire and wireplumber configuration files as spajson
filetype, include filetype, indent and syntax scripts for this
new filetype (David Mandelberg).
I looked at all the files found by this command to see if the syntax
highlighting looked reasonable:
```
find {~/.config,/etc,/usr/share}/{pipewire,wireplumber} -type f -name \*.conf
```
References:
* pipewire config files: https://docs.pipewire.org/page_config.html
* wireplumber config files:
https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration/conf_file.html
and
* https://pipewire.pages.freedesktop.org/wireplumber/daemon/locations.htmlcloses: #16950
Signed-off-by: David Mandelberg <david@mandelberg.org>
Signed-off-by: Christian Brabandt <cb@256bit.org>
