Option to randomize the Frogs 2 melody

[fenhl]

This PR turns the “Randomize Ocarina Melodies” setting into a multiselect and adds a 3rd option “Frogs Ocarina Game” which randomizes the song that needs to be played for the “ZR Frogs Ocarina Game” check. The notes appear in the spoiler log and can be plando'd like the other melodies, but the melody is locked to a length of exactly 14 notes. Rather than using the existing algorithm for generating random songs, a fully random sequence of notes with even weights is generated.

Special thanks to @rrealmuto whose random_frog_song branch served as the basis for this PR.

I've also included a drive-by fix where the misc. location hint for frogs 2 was incorrectly assumed to be reachable as adult.