Better error reporting

[alkurbatov]

From @Rorschach on Discord:

I don't have an github account,
honestly the one big problem was that if the laddermanager doesnt find the map, it tried to start the game anyways and as "reason for the crash" it looks like there was a timeout or so, but in reality it could not start the game because it had no map
if you read the whole consol output you see it, but when you just look at the end and to see why it crashes it's not clear

Looks like we need to improve error reporting in some way (currently there are lots of messy output) in some way. Probably show only stderr or drop unused info?

Also, I would say, that we need a troubleshooting guide.

[lladdy]

+1 for this if anyone gets time. We could probably utilize exceptions to clean up a lot of the error handling and reporting.

[Cryptyc]

yeh, its something I'll definately look at after this season of the ladder is over. Really busy with getting the tournament and everything sorted right now though