Properly handle texture size limit

**Problem**
WGPU defines a texture dimension limit. If this size is exceeded, the app panics.

**Feature**
Propertly handle textures with size higher than limit.

**Tasks**
- Set up correctly the WGPU limits
- Handle depth texture in case of big resolution (e.g. 4K)
- Handle too big user textures
- Handle too big text textures (reduce font height)