Add basic pulseaudio source (microphone etc.) support

[julianschuler]

This PR adds basic pulseaudio source support. The conky objects if_pa_source_running and if_pa_source_muted were added to query the status of the default pulse audio source.

I implemented this feature to display if an application is accessing my microphone and if it is currently muted or not:

running	muted	not running

The added features can be tested using

conky -t 'microphone\
$if_pa_source_running\
$if_pa_source_muted muted\
$else running\
$endif\
$else not running$endif'

which will display the current source state accordingly.

Other features of conky remain unchanged, though some other code was reformatted when using make clang-format.

[github-actions]

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[julianschuler]

Update: Rebased to latest main. Please let me know if you want me to change anything else (since this is already open for over 2 years)!

[LinuxOnTheDesktop]

This seems good. It is unclear to me though how one queries any one device (e.g. the microphone) as against another (e.g. the speakers).