v3.0.0

• Add ProtoWireObject, a low-level alternative to ProtoObject.
• Support encoding: ProtoObject can now be converted back to protobuf wire data.
• Support protoscope formatting.
• Add decoding options: PreferredStringDecodingModes, Fixed32DecodingMode, Fixed64DecodingMode.
• Decode two characters ASCII strings as strings instead of embedded messages.
• Add ProtoObject.SortFields.
• Improve debugger display.
• Support protobuf groups.