improve godot tile system to increase fps

[rafaelcastrocouto]

• [x] reduce number of tile layers
• [ ] auto bake static tile layers
• [ ] mipmap tiles acoording to the camera zoom

[WhalesState]

i don't know if canvas culling works by default for Tilemaps but maybe we can try to use visibility notifier. https://docs.godotengine.org/en/stable/classes/class_visibleonscreennotifier2d.html consider dividing the large maps into smaller ones first.