Textures take too much space

[Nielsbishere]

Is your request related to a problem? Please describe.
After debugging/profiling it seems that ~50-60% of the memory is taken up by texture allocations.

Describe the solution you'd like
To reduce the memory in general, use texture compression (dds textures). Before we add compression however, it is important to free the allocated CPU memory and GPU intermediate texture.

Describe alternatives you've considered
Additional context
N.A

[Nielsbishere]

#228 Cleans up intermediate texture allocations

[Nielsbishere]

Cubemap intermediate is also (probably) being left over, I'll look into it further.

EDIT: #241

[Nielsbishere]

The skybox is mipmapped but doesn't have to be, this costs approx 50% more memory than without mipmapping, as the mips aren't used anywhere.