inStreetPreview

is true if the user is in StreetPreview mode

The heading prioritization comes from iOS - see https://github.com/Scottish-Tech-Army/Soundscape-Android/issues/364

collection - used for calculating callouts, two possibilities: course (travel), user (head), device (phone), or user (head), device (phone), course (travel)

presentation - user for audio positioning: user (head), course (travel), device (phone)