Automatically upload client game state and demo file upon desync crash report

[GoogleFrog]

This probably requires some talking to engine devs, and possibly some standardisation, so that the wrapper can reliably know which files to attach.

[sprunk]

Apparently the dump is placed in the same folder as infolog.txt, and is named ClientGameState-X-[Y-Z].txt where Y-Z are numbers of the frame period when the desync happened and X is the result of calling unsynced math.random(0, 2^32 - 1). So AFAICT there isn't anything that matches a desync to a dump other than taking an educated guess based on other metadata like file timestamps, and different people will even roll a different X for the same desync.

There is some useful data like gameID but it's inside the file's contents and would have to be parsed.