v0.4

- Fix torque (almost, there is still a little difference in test, but numbers are much more closer now)

- Fix concave polygon

- Add support for conveyer belt

- Add build for web but not enabled yet (bug in godot-cpp)

- Update/fix support for skewing/scaling for shapes.

V0.3 - small release, skipped here.

- Fix mac binary signing

- Add basic implementation for force_integration_callback