chat: further tweaks and cleanups

different implementation for utf-8 char detection/handling

chat: generate utf8 info e.g. for pasted contents

fix techracer map 3 another small test map

- ?Fix? nemo's attempt in r959219241c67 - Wrap mode: camera comes to followgear by the shortest path (better implementation, than sheepluva's re0d7d499c851) - Wrap mode: keep less than 50% of the screen grayed

merge

ups, forgot we need to make TechRacer aware of airmines