Restructured player_info page to now include more detailed stats for specific gametyp...

Restructured player_info page to now include more detailed stats for specific gametypes (currently duel,dm,tdm,ctf)
The total_stats dictionary now also holds much more information than before, especially gametype-dependent info
Also added "favorite server" line, showing on which server the player is most likely to be found

This commit implements some of the suggestions from Feature Request #1039:
Organizing Player page statistics - http://dev.xonotic.org/issues/1039