Makes drivers less sucky to manage from usermode.

There are two "types" of drivers - "generic" drivers (which are loaded from disk), and "buffered" drivers (which are loaded from a byte array). To help manage this polymorphism, IDriver instances must be created with DriverFactory. If a file path is specified, the IDriver instance will be a type of GenericDriver, and if a byte buffer is specified, the IDriver instance will be a type of BufferedDriver.

Here's a short GenericDriver example that loads the driver C:\fonz64.sys.

DriverLib::IDriver* driver = DriverLib::DriverFactory(L"fonz64")
    .setFilePath(L"C:\\fonz64.sys")
    ->setDeviceName(L"dbk64")
    ->build();
driver->load();
driver->sendIOControlRequest<Request>(IOCTL_DEFINITION, new Request());
driver->sendIOControlRequest<Request, Response>(IOCTL_DEFINITION, new Request(), new Response()));
driver->unload();
delete driver;

NB: IDriver does not clean up for you. You must still unload the driver before deleting the driver object.