doc: make all manpages with Doxygen

Use (fixed-up) Doxygen manpage output for all program & module manpages.

This also allows formatting the manual pages properly in the HTML docs.

The Markdown pages work properly only with Doxygen >= 1.9.7, older
versions put them to wrong place in the HTML docs.

doc/dox/programs/pw-mididump.1.md

@@ -0,0 +1,38 @@
+\page page_man_pw-mididump_1 pw-mididump
+
+The PipeWire MIDI dump
+
+# SYNOPSIS
+
+**pw-mididump** \[*options*\] \[*FILE*\]
+
+# DESCRIPTION
+
+Dump MIDI messages to stdout.
+
+When a MIDI file is given, the events inside the file are printed.
+
+When no file is given, **pw-mididump** creates a PipeWire MIDI input
+stream and will print all MIDI events received on the port to stdout.
+
+# OPTIONS
+
+\par -r | \--remote=NAME
+The name the remote instance to monitor. If left unspecified, a
+connection is made to the default PipeWire instance.
+
+\par -h | \--help
+Show help.
+
+\par \--version
+Show version information.
+
+# AUTHORS
+
+The PipeWire Developers <$(PACKAGE_BUGREPORT)>;
+PipeWire is available from <$(PACKAGE_URL)>
+
+# SEE ALSO
+
+\ref page_man_pipewire_1 "pipewire(1)",
+\ref page_man_pw-cat_1 "pw-cat(1)"