Allow user to specify project names

[ykevu]

It may be useful, particularly in conjunction with #495, to allow the user to give projects names (they can default to 'Untitled Project' or their project ID). The name can simply be stored in a state machine and in the IndexedDB. When/if an alternative data storage solution is implemented (such as zarr) on S3, we can store the name in the metadata as well so it isn't just local.