#479: add math Shape2D destructure extensions and MapRenderer use extension

[Quillraven]

PR for #479

Unfortunately, the beginRender() and endRender() methods of the OrthogonalTiledMapRenderer are protected, which means we cannot call them directly.
I never needed a custom renderer or had to override those methods. Also, they seem to never change in recent LibGDX versions. That's why I think "copy&pasting" their content is fine in this case. However, I still added a remark in the ReadMe.md that this can be a potential issue.

If you have a problem with it then feel free to remove those extensions :)

[czyzby]

Unfortunately, the beginRender() and endRender() methods of the OrthogonalTiledMapRenderer are protected, which means we cannot call them directly.

There's a cheesy way to get around this. Create a separate Kotlin file, set the package to match OrthogonalTiledMapRenderer (with a warning suppression that is doesn't match the folder structure 😉), make utility functions or extension methods that call the beginRender() and endRender(), and finally use those in the use extension. This would call any overridden methods.

[Quillraven]

Unfortunately, the beginRender() and endRender() methods of the OrthogonalTiledMapRenderer are protected, which means we cannot call them directly.

There's a cheesy way to get around this. Create a separate Kotlin file, set the package to match OrthogonalTiledMapRenderer (with a warning suppression that is doesn't match the folder structure 😉), make utility functions or extension methods that call the beginRender() and endRender(), and finally use those in the use extension. This would call any overridden methods.

I did that trick now. Did not know about it and feels weird that this is even possible :) But a nice solution imo for this scenario.

[czyzby]

@Quillraven I missed that you've set the master as the target branch instead of develop. Can you set another PR to the develop branch? Sorry!