VBS Enclave SDK 0.1.2 (PreRelease)

The SDK has now been updated to use the vbs enclave code generator version 0.1.2-prerelease internally.

Nuget package link:
https://www.nuget.org/packages/Microsoft.Windows.VBSEnclave.SDK

What's Changed

• update sdk to use new codegen package version by @bbonaby in #138

Full Changelog: codegen-v0.1.2-prerelease...sdk-v0.1.2-prerelease