Fix inconsistencies in guest nick name generation
When the setting net/nick is empty, HW generates a guest name. But there were several problems:
- Team name did not match guest name
- Random guest number was re-rolled multiple times, causing inconsistencies
- Guest number was often too large (now capped at 99999)
en=Knock your opponents off the platforms using only a bat!
de=Schubs deine Gegner von den Plattformen nur mit einem Baseball-Schläger!
pl=Zrzuć swoich przeciwników z platform_c używając tylko kija!