1. Minor modification in _muludiv64 calls to ensure result is always accurate
2. Make sure dragging the thumb before the start of the playback does not result in putting the thumb at the end of playback
Merge remote-tracking branch 'panos/bugfix-13257' into bugfix-13257
Merge branch 'bugfix-13257' into develop
Merge branch 'develop' of https://github.com/runrev/livecode into develop