Minor update

• General
  • Added an explicit authentication method for cloud gateways. All other gateway methods still require successful authentication to the cloud service.
    
    Note: This breaks compatibility with the previous versions of ICloudGateway and IAsyncCloudGateway.
  • Fixed cross-thread marshalling of authentication tokens
• Updated NuGet packages
• Box.V2 to version 2.10.0
• Google.Apis.Drive.v2/v3 to version 1.15.0.567
• OneDrive SDK to official version 1.1.47
• NewtonSoft.Json to version 9.0.1
• Gateways
  • Updated OneDrive gateway to use official Microsoft OneDrive SDK for CSharp version 1.1.47
  • Fixed capabilities for OneDrive gateway to support empty files
  • Updated GDrive gateway to use Google Drive API v3
  • Renamed and moved legacy gateways for OneDrive and Google Drive v2
  • Fixed missing assembly signing configuration for hubiC gateway in build configuration Signed
  • Included local build of MediaFireSDK with limited support for MediaFire session token v2
    (lifetime 2 years instead of 10 minutes)

Unsigned and signed libraries available from NuGet:

• CloudFS
• CloudFS-Signed