Add smart card support

[thecristidima]

This is work-in-progress, it depends on the upgrade to FreeRDP 3 (we can consider it part 3) - see this PR first #44.

Added smart card support from FreeRDP. Changes required to create a session:

• Enable a few settings
• Load audio channel - not clear why it's required, but freerdp_connect will return TRUE but the session won't be created unless it's loaded
• Set instance->ChooseSmartcard for cases where a user has multiple certificates; Robot.Session already finds the smart card certificate to validate the logon credentials, so we'll just have to pass the container name to the wrapper.
• Import a few more external libs

Known issues:

• Kerberos is used for smart card authentication and Local System can't use it, so we need to run the wrapper under a normal user; as discussed, we'll run the wrapper out-of-process to work around this limitation
• FreeRDP can't authenticate if the smart card has multiple certificates enrolled on it; since we can create multiple virtual smart cards, we can just enroll each certificate on a different one