Allegro finished, before Meno Messo
Great Gate, use two ily files
Fix some automatic layout glitches

Fixing easy hanging fruit like ugly slurs. Also move more hidden tempo
to dynamics section, as well as some dynamics to left hand.
Merge branch 'great-gate' of https://github.com/ksnortum/The-Mutopia-Project
Merge branch 'rachmaninoff-prelude23-01' of https://github.com/abelcheung/The-Mutopia-Project
Update Mutopia footer