Changelog
- Update to Go 1.18
- Make the temporary plugin directory configurable.
- Improve strict function typechecking, as well as list indexing typechecking.
- Stop using zero copy JSON decoding, it's buggy.
- Introduce much better object support, with new syntax for accessing object fields (object -> field_name).
- Improve old plugin API Level error message.
- Fix tempdir name used by Plugin executor.