DIP-20 opcode support

[thephez]

DIP-20 adds/re-enables a number of opcodes as described here. This DIP is implemented in Dash Core 0.17.0 via dashpay/dash#3824 and dashpay/dash#3893.

Expected Behavior

Dashcore-lib will support the opcode changes

Current Behavior

Dashcore-lib does not yet support the opcode changes

[SamKirby22]

Agreed on triage to process as a P4