[ENHANCEMENT] Selecting Random in Freeplay can choose a Random available instrumental

[VioletSnowLeopard]

Does this PR close any issues? If so, link them below.

Closes #3570

Briefly describe the issue(s) fixed.

Currently, using the random capsule to choose a song always uses the base instrumental for the song. This PR allows the random capsule to choose a random instrumental from the list of available instrumentals for the song.

Include any relevant screenshots or videos.

Videos of the random option choosing the Pico instrumental for the song:

dadbattle.mp4

philly-nice.mp4

[TechnikTil]

thing is...
what if people don't want random to change the instrumental?

there should be a way to deny random from changing the instrumental

[sphis-Sinco]

Could you have a way of displaying what instrumental was chosen and having an option to change the instrumental? I wouldn't want to play regular Roses with the regular instrumental but then get the Pico variation.

[sphis-Sinco]

Thanks for implementing my recommendation!
Looking good!

[VioletSnowLeopard]

When selecting the random capsule, you can now choose if you want the instrumental to be random or default:

choose-random-or-default.mp4

[sphis-Sinco]

thing is... what if people don't want random to change the instrumental?

there should be a way to deny random from changing the instrumental

Heh

[Hundrec]

Okay, this is very cool

[TechnikTil]

ok im happy now

[amyspark-ng]

oh that's peak
that's peak...