Play custom melody when DSHOT beacon 5 is triggered

[stylesuxx]

References:

• https://github.com/bird-sanctuary/bluejay/pull/18/commits/5552622d9b8ad31ca13fd90627db0fb50e27af61
• https://github.com/bird-sanctuary/bluejay/pull/18/commits/f04ced71692305131de01862ae0ef5ff49639416

Features:

• When beacon melody is set to 5 via BF, then it will play the custom melody
• A wait setting is introduced in order to allow syncing melodies so that the "ready beeps" don't interfere with playing the melody (develop version of esc-configurator.com is required)