Practically all fauna have a 2:1 length to width footprint ratio. However, citizen cavalry has a 3:2 ratio and worker elephants a circular footprint. This patch changes their footprints to the more appropiate 2:1 ratio.
Before: {F1238620}
After: {F1404854}
A larger footprint also makes units more vulnerable to long range projectiles (e.g. arrows), so this patch makes citizen cavalry a smaller target. For comparison:
```
citizen/champion/hero infantry footprint: 7
cavalry footprint:
citizen: 24→18
champion and hero: 20 (circular because of selection marker)
elephant footprint:
worker: 50→32
archer: 38→32
champion: 38 (circular)
hero : 28 (circular)
```
Also tweaked footprint height to:
* infantry: 4
* cavalry: 6
* kush and ptol camel: 7.5
* maur elephant archer: 9
* maur worker elephant: 8
[EDIT]: And removed some unnecessary footprint lines from infantry templates.