preliminary audio support#76

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ubaldus wants to merge 5 commits intopulkin:masterfrom

Commits on Sep 3, 2020

preliminary audio support
ubaldus
committed

Commits on Sep 4, 2020

removed sleep loop in record and play functions and renamed both to play_start and record_start
ubaldus
committed

Commits on Sep 7, 2020

Call AUDIO_Stop() in case AUDIO_Play() return error
ubaldus
committed

Commits on Sep 9, 2020