Read and write best time trial frames

This is basically just bolting on the "frames" part of a time trial
score. There's not enough space to properly show it on the time trial
select screen, maybe we can figure something out later. But I at least
want to implement the functionality now.

desktop_version/src/Game.h

@@ -297,6 +297,7 @@ public:
 
 
     std::vector<int>besttimes;
+    int bestframes[6];
     std::vector<int>besttrinkets;
     std::vector<int>bestlives;
     std::vector<int> bestrank;