Add support for SAPI 5 in process recognizer

This change adds the Sapi5InProcEngine class, derived from
Sapi5SharedEngine but using the in process recognizer instead of the
shared recognizer.

Resolves #3.
Improve auto selection of backend engine

This change improves the automatic selection of which backend engine to
use by registering the first engine that is initialized, and setting it
as the subsequent default engine.
Use SAPI5 in process instead of shared engine

This change uses Sapi5InProcEngine in the WSR loader example instead of
Sapi5SharedEngine.

This change also increases the logging verbosity of the loader example.