Accessibility option

Closes #6 (closed)

• Option to toggle on/off
• fade sfx after 1s of being played
• make bg more transparent if positional sound are far away
• when a panel disappears, lower all the panels above by 1 (😭)
• fix TODO about same sound played at different positions
• avoid crash when playing the same sound, positional first and non later (and vice versa)
• figure out how to shift down by 1 when a "@" sound finishes and more are being played
• [ ] stop tracking a positional sound as soon as it ends for the future (it requires duration)
• remove all the logs and revert the sfx item