Codechange: Place gamelog into its own class, along with internal data.

Data is now stored in vectors to avoid manual memory management and
passing lengths around.

src/os/unix/crashlog_unix.cpp

@@ -155,7 +155,7 @@ static void CDECL HandleCrash(int signum)
 		signal(*i, SIG_DFL);
 	}
 
-	if (GamelogTestEmergency()) {
+	if (_gamelog.TestEmergency()) {
 		printf("A serious fault condition occurred in the game. The game will shut down.\n");
 		printf("As you loaded an emergency savegame no crash information will be generated.\n");
 		abort();