*TODO: why is alsa's snd_ctl_card_info_free(info) causing double free error (valgrind's "Adress  is is 40 bytes inside a block of size 376 free'd)? No clue. But with that call disabled, everything works as it should and valgrind reports no further errors.

reverted 0.43 backport as its implementation seems unstable when trying to (re)connect to jack via audio properties. Fixed a bug where closing jack while having DAC on would hang pd.

backported audio driver support from 0.43 and the pd/extra folder with supporting fixes/merges where needed. Removed outdated expr-help file in favor of new documentation.