Proto commits in magenta/note-seq

These 7 commits are when the Protocol Buffers files have changed:

Commit:d7153cd
Author:Adam Roberts

Make root note_seq dir

The documentation is generated from this commit.

Commit:bda82e1
Author:Adam Roberts
Committer:Copybara-Service

NoteSequence Library Migration (#1360): Remove unnecessary TensorFlow references. PiperOrigin-RevId: 315345091 Change-Id: Ib5442d94e4bfb0a4ce8cb42d906100ab3132d035

Commit:436823d
Author:Copybara-Service

Merge pull request #1570 from cifkao:magenta-music PiperOrigin-RevId: 281445880

Commit:fd5ea34
Author:Ondrej Cifka

Move generator_pb2 and sequence_generator out of music

Commit:23feed1
Author:Ondřej Cífka

Move magenta.music back to magenta

Commit:de1077b
Author:Ondrej Cifka
Committer:Ondrej Cifka

magenta.music as a separate package

This commit does not contain any .proto files.

Commit:97146d1
Author:Curtis Hawthorne
Committer:Copybara-Service

open source fine alignment tool PiperOrigin-RevId: 240378506