Add scroll view to subsong list

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Update version number and changelog

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Add subsong explorer button to sidebar

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Write all sequences button status to shared prefs

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Set sidebar button background as transparent

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>