Testing new check to stop duplicate IPv4 addresses being used with Masternodes and Systemnodes
- Introduced new checks to make sure the same IPv4 address cannot be used when creating or running a Masternode or Systemnode.
- Set MAX_MONEY to represent the actual maximum amount the Crown network should produce.
- Added 1 testnet seed node.
- Updated the sandbox script to use Python 3.
- Syntax changes.