Merge pull request #32 from KroArtem/master

Get rid of printf/cout in kart_selection.cpp, cppcheck fixes
Unset AF when not requested

AF was never unset thus making it enabled everywhere even when there was
a 1:1 fragment/texel mapping.
This makes a significant performance boost when AF is enabled.
Fix fog looking weird on transparent.

But mixing alpha with 0 instead of 1.
Merge pull request #36 from KroArtem/master

Clean src/modes and src/karts from old logging code
fixing some memleaks