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-dump.1.md

@@ -0,0 +1,43 @@
+\page page_man_pw-dump_1 pw-dump
+
+The PipeWire state dumper
+
+# SYNOPSIS
+
+**pw-dump** \[*options*\]
+
+# DESCRIPTION
+
+The *pw-dump* program produces a representation of the current PipeWire
+state as JSON, including the information on nodes, devices, modules,
+ports, and other objects.
+
+# OPTIONS
+
+\par -h | \--help
+Show help.
+
+\par -r | \--remote=NAME
+The name of the *remote* instance to dump. If left unspecified, a
+connection is made to the default PipeWire instance.
+
+\par -m | \--monitor
+Monitor PipeWire state changes, and output JSON arrays describing
+changes.
+
+\par -N | \--no-colors
+Disable color output.
+
+\par -C | \--color=WHEN
+Whether to enable color support. WHEN is `never`, `always`, or `auto`.
+
+# 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-cli_1 "pw-cli(1)",
+\ref page_man_pw-top_1 "pw-top(1)",