New free asset: Converter For Unity Splines

[_Aka_]

Converter 1.2.0 is now available. Here is the release notes:

Code:

### Added

- Conversion from Curvy splines to Unity splines.

- Messages window, available at Window -> Converter -> Messages.

- Menu item to open the asset's publisher's page.

### Changed

- Converter now compiles even if Curvy Splines is missing.

- Minimum Curvy Splines compatible version is now 8.9.1.

### Fixed

- Newly created splines are not converted automatically.

- Converting a Unity spline removes all its children.

Currently, there are some limitations regarding converting Curvy Splines to Unity Splines. I aim to lift these limitations in the future:

1. You can't convert B Splines and TCB splines.
   
2. The converted Catmull-Rom splines can be different from the source spline. This is due to a Unity using Centripetal Catmull-Rom, while Curvy Splines uses Uniform Catmull-Rom