Use stringstream instead of visual studio specific sscanf_s
Fixed compiler warning.
Avoid writing the players.xml file multiple time at the exit time.
Use CMAKE_CXX_FLAGS instead of add_definitions for additional flags
Merge branch 'master' of https://github.com/supertuxkart/stk-code
Fix loss of associated online user name if stk is played offline
(might be a fix for #1595).
Merge branch 'master' of github.com:supertuxkart/stk-code
Fixed compiler warnings
Merge branch 'master' of https://github.com/supertuxkart/stk-code