Textures are flipped by TextureLoader

[OLEGSHA]

When textures are loaded, they are stored in memory vertically flipped. TextureLoader explicitly flips the images. To resolve this issue, not only TextureLoader has to be modified, but also most of the UV maps in the game (primitives and entity models).

This is a problem both because the UV maps are counter-intuitive to experienced developers and because most libraries, specifically, GLFW, expect a certain memory layout for image data.