Display which player(s) are OOS when it happens. Also fix some encoding issues with file paths.
Patch by elexis, fixes #3293.
This line didn't compile on windows and was reverted by rP16965.
From 2015-08-30-QuakeNet-#0ad-dev.log:
< Itms> apparently it's because Path::String is a wstring
This compiles cleanly on my unix platform:
std::stringstream foo; foo << L" bar";
but apparently it may not do so well on windows.