Move Game Complete sequence to new text box system

In order to be able to retranslate the game time text box in particular,
I had to create new variables to bake the saved time, since the existing
savetime variable is just an std::string. From there, the saved time can
be retranslated on-the-fly.

desktop_version/src/Game.h

@@ -359,6 +359,7 @@ public:
     bool gamesaved;
     bool gamesavefailed;
     std::string savetime;
+    int saveframes, saveseconds;
     int savetrinkets;
     bool startscript;
     std::string newscript;