This changes running speed into a running multiplier (of walk speed).
The advantage is that it simplifies code since you can setup a default run multiplier at the template level and it'll work for all subsequent templates, and technologies cannot forget to change it. It makes specialised unit templates easier to maintain, too.
We could alternatively remove all running capabilities, but the code needs to handle speed in the [0;1] * walk speed range for formation/group walk so it's not a huge hassle to have.