various improvements

[EvanBldy]

Problem

• Some libs are outdated.
• The blueprint that serve files is registered whether FS_SERVE is to False.
• There's no settings.json for vscode to set black as default formatter.
• There's no config option for s3 and swift to not head/put bucket/container at init.
• It's not possible to set multiple backends encrypted or not in the same app, because it's a global configuration option.

Solution

• Upgrade some libs.
• The blueprint that serve files is not registered when FS_SERVE is to False.
• Add settings.json for vscode to set black as default formatter.
• Add config option for s3 and swift to not head/put bucket/container at init : FS_SWIFT_CREATE_CONTAINER / FS_S3_CREATE_BUCKET
• It's now possible to set multiple backends encrypted or not in the same app, it's now a backend config option.