Adjusting infantry run animations to speed

I noticed that by default the run and prone-run animations are way too fast for the infantry movement speed. I used Tick values to fix this, taking into account individual speed. I used Tick: 80 for Speed: 5, 100 for speed 4 and 120 for speed 3. Some fine-tuning may be needed, but it already looks much better than before.
Merge pull request #3291 from reaperrr/patch-2

Adjusting infantry run animations to speed