Introduce quality option for SAPI service

This is fed in through the Format.Type property on the SpFileStream, and
has options ranging from 8 kHz through 48 kHz.
Documentation update for SAPI page

Includes a new screenshot and mentions the new Quality option.
Additional notes on SAPI quality matching

Talks about getting different output based on matching the quality level
to your voice source.
Merge branch 'sapi5-sampling' into develop

Brings in the new Quality option for the SAPI5 service, allowing users
to match input voices to the sampling rate.

Closing #57.