Working on textures

- Downsamples the grass details (which involved resizing down with nearest neighbour as usual, but then redrawing in various stalks that got broken by that process) -- looks kind of nice
- Also downsampled the sky a bit so it's more in keeping
- Also worked on the concrete material to make it flatter. I turned metallic all the way up and reduced the impact of the normal map, but I'm not too too sure whether either of those are good ideas longer term. That said, all the buildings will be made of that material so I can change everything at ones when I get to it.
- I should ask that brutalist architecture guy what he does for concrete textures? Not that I'm totally going for brutalism, but it's a good style for shadows eh? And a hell of a lot of concrete.
- webgl updated for this one