Perf: Bound file coupling pair generation - #60

Implement IMessagePackFormatter<Timeline?> (with nullable annotation) (https://github.com/MessagePack-CSharp/MessagePack-CSharp/blob/master/doc/analyzers/MsgPack014.md)

The value of a property with an init accessor and an initializer will be reset to the default value for the type upon deserialization when no value for them is deserialized (https://github.com/MessagePack-CSharp/MessagePack-CSharp/blob/master/doc/analyzers/MsgPack017.md)

The value of a property with an init accessor and an initializer will be reset to the default value for the type upon deserialization when no value for them is deserialized (https://github.com/MessagePack-CSharp/MessagePack-CSharp/blob/master/doc/analyzers/MsgPack017.md)

The field 'DebugWindow._showFullPaths' is never used

Parameter 'visibility' is unread.

Implement IMessagePackFormatter<Timeline?> (with nullable annotation) (https://github.com/MessagePack-CSharp/MessagePack-CSharp/blob/master/doc/analyzers/MsgPack014.md)

The value of a property with an init accessor and an initializer will be reset to the default value for the type upon deserialization when no value for them is deserialized (https://github.com/MessagePack-CSharp/MessagePack-CSharp/blob/master/doc/analyzers/MsgPack017.md)

The value of a property with an init accessor and an initializer will be reset to the default value for the type upon deserialization when no value for them is deserialized (https://github.com/MessagePack-CSharp/MessagePack-CSharp/blob/master/doc/analyzers/MsgPack017.md)

The field 'DebugWindow._showFullPaths' is never used