Move debugging options into a separate INI section, since I use them

very frequently, and they're mostly not available in the menus.

Add LogCheckpoints.

Move checkpoint code into a namespace.

stepmania/src/archutils/Win32/Crash.cpp

@@ -716,7 +716,7 @@ static void DoSave(const EXCEPTION_POINTERS *pExc)
 	Report(NULL, hFile, "");
 
 	// Dump thread stacks
-	WriteBuf( hFile, GetCheckpointLogs("\r\n") );
+	WriteBuf( hFile, Checkpoints::GetLogs("\r\n") );
 	Report(NULL, hFile, "");
 
 	ReportCrashCallStack(NULL, hFile, pExc);