v6.5.0 (update)
remove ABIJSON.parseABIObject methods -- use fromJson & fromJsonObject in Function, Event, ContractError, & ABIObject;
remove TupleType#encodeElements -- use TupleType#encode;
remove ABIType#_validate(Object) -- use ABIType#validate(J);
add method Function#decodeSingletonReturn(ByteBuffer);
add method Event#isElementIndexed(int);
make Function#encodeCall(Tuple,ByteBuffer) return void;
optimization for repeated dynamic tuple encodes when using the same Function object;
SHA-256 (headlong-6.5.0.jar): f732d1b4120020603e8a8adb2fc80e18dd66f619c757ef19115eadf08052e14f