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-config.1.md

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+\page page_man_pw-config_1 pw-config
+
+Debug PipeWire Config parsing
+
+# SYNOPSIS
+
+**pw-config** \[*options*\] paths
+
+**pw-config** \[*options*\] list \[*SECTION*\]
+
+**pw-config** \[*options*\] merge *SECTION*
+
+# DESCRIPTION
+
+List config paths and config sections and display the parsed output.
+
+This tool can be used to get an overview of the config file that will be
+parsed by the PipeWire server and clients.
+
+# COMMON OPTIONS
+
+\par -h | \--help
+Show help.
+
+\par \--version
+Show version information.
+
+\par -n | \--name=NAME
+Config Name (default 'pipewire.conf')
+
+\par -p | \--prefix=PREFIX
+Config Prefix (default '')
+
+\par -L | \--no-newline
+Omit newlines after values
+
+\par -r | \--recurse
+Reformat config sections recursively
+
+\par -N | \--no-colors
+Disable color output
+
+\par -C | \-color\[=WHEN\]
+whether to enable color support. WHEN is
+*never*, *always*, or *auto*
+
+# LISTING PATHS
+
+Specify the paths command. It will display all the config files that
+will be parsed and in what order.
+
+# LISTING CONFIG SECTIONS
+
+Specify the list command with an optional *SECTION* to list the
+configuration fragments used for *SECTION*. Without a *SECTION*, all
+sections will be listed.
+
+Use the -r options to reformat the sections.
+
+# MERGING A CONFIG SECTION
+
+With the merge option and a *SECTION*, pw-config will merge all config
+files into a merged config section and dump the results. This will be
+the section used by the client or server.
+
+Use the -r options to reformat the sections.
+
+# EXAMPLES
+
+\par pw-config
+List all config files that will be used
+
+\par pw-config -n pipewire-pulse.conf
+List all config files that will be used by the PipeWire pulseaudio
+server.
+
+\par pw-config -n pipewire-pulse.conf list
+List all config sections used by the PipeWire pulseaudio server
+
+\par pw-config -n jack.conf list context.properties
+List the context.properties fragments used by the JACK clients
+
+\par pw-config -n jack.conf merge context.properties
+List the merged context.properties used by the JACK clients
+
+\par pw-config -n pipewire.conf -r merge context.modules
+List the merged context.modules used by the PipeWire server and reformat
+
+# 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-dump_1 "pw-dump(1)",