Use consistent types for channels, rate, and latency in API.
Use consistent types for channels, rate, and latency in API.

Chose to use uin32_t because it was the type that is taken by
cubeb_get_max_channel_count, cubeb_get_min_latency, etc.

kinetiknz/cubeb,kinetiknz/cubeb,kinetiknz/cubeb