Neo 3 Preview 4 Support

This preview adds Neo 3 preview 3 support for Neo Express. New features in this release include:

• Offline mode - modify the state of the blockchain while it is not running. Particularly useful for configuring dev/test checkpoints
• Oracle commands - enable oracle support, list outstanding oracle requests and submit oracle responses for Neo Express instances
• Nep17 token tracker - support for standard getnep17balances and getnep17transfers RPC methods
  • Note, the Neo 2 era NEP-5 proposal has been superseded by the NEP-17 proposal in Neo 3 preview 4.

Note, this preview release is using a temporary naming scheme to differentiate it from the production Neo-express release. The package is named Neo.Express3 and the tool is named nxp3. This naming allows developers to install both the production and insider releases of Neo-express at the same time. The package and tool names are temporary and will change before final release.

You can install this pre-release of Neo Express directly from the build server NuGet feed by executing the following command at a terminal prompt:

> dotnet tool install -g Neo.Express3 --add-source https://pkgs.dev.azure.com/ngdenterprise/Build/_packaging/public%40Local/nuget/v3/index.json --version 1.2.85-insiders