[MU4 Task] Mixer: Add "Choose automatically" option for Muse Sounds

[avvvvve]

This will resolve #15573

Task description

As a user choosing sounds in the mixer, I should be able to select an option that chooses the correct Muse Sounds sound for the current instrument so I don't have to look for the correct instrument in the context menu layers.

Requirements

• Add "Choose automatically" and a divider line to the top of the context menu that appears when you click a Mixer channel's sound button and hover on Muse Sounds (copy how this appears in the MS Basic context menu).
  

• When clicked, "Choose automatically" becomes checked. In the background, MS assigns the corresponding Muse Sounds sound (i.e. if instrument is "Trumpet in B♭", clicking "Choose automatically" will assign the Muse Sounds "B♭ Trumpet" sound).

• "Choose automatically" is enabled only if the user has already installed the corresponding Muse Sounds sound for the instrument. For example, if Muse Strings isn't installed, the "Choose automatically" will be disabled for a Violin instrument. (Disabled style: 30% opacity)

• When Muse Sounds is activated as the playback profile in Playback setup, "Choose automatically" should become selected for all instruments. If there is no Muse Sounds instrument, select "Choose automatically" within the MS Basic menu.