Performance mode for layers

[arthuro555]

Pixi has a ParticleContainer, a special type of container that is much more performant than the base one, solely focused on speed. It comes at the tradeoff of not supporting more advanced features, like nested objects, shaders, and masking. But texts and sprites with only position and rotation as transform are what most users will be usually working with the most in GDevelop. Therefore, I think it would be cool to provide the option for a layer to be using such a container in GDevelop to allow making performance optimizations.