FlexASIO crashes if methods are called on an uninitialized driver

[dechamps]

CFlexASIO::EnterInitialized() checks that the driver is initialized before handling a driver method call. The problem is, if the check fails, EnterInitialized() throws a C++ exception (without a catch) instead of returning an ASIO error code. This will likely crash the entire host process.

This bug mirrors dechamps/ASIO401#20 since the relevant code is the same. In practice it's benign because the crash can only occur if an application is misusing the driver, which should not happen in the first place.

[dechamps]

This is fixed in FlexASIO 1.6.