Fix crashes, add tests and update doc of `ImageBlender`

goostengine / goost

A general-purpose, extensible and customizable C++ extension for Godot Engine.

https://goostengine.github.io/

MIT License

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Closed 98teg closed 3 years ago

98teg commented 3 years ago

Part of #120.

I also added tests to ImageBlender and updated the doc. It includes a fix to blend_colors behaviour.