Fix camera init test

Broke with implementation of #84
Fix sense of denoise parameters

As per raspberrypi/userland@7a4f7697214fd5c496cbca016bf8a2369d5f01a9
Fix privacy indicator struct

As per raspberrypi/userland@18430f0577e89b3c0ad6d9ec9409776ed0162a54
Fix #16
Add some missing checks
Add #16 to the changelog

and update the date for the planned release tomorrow