Rework resource with resource providers

This merge request rework the resource loader to:

• Use stream as much as possible (instead of path)
• Path are still used for SSL files (but that's something which probably have to be discussed outside of this MR)
• Create specialised resource providers to allow to create new ones

For that:

• A package daiquiri.core.resources was created for the implementation
• daiquiri.resources.utils still contain the root provider
• YamlDict was created to replace ConfigDict
• Every part of the application was updated with this new API

The aim is to be able to implement a Beacon resource provider at one point.

On side change:

• daiquiri.app was moved into daiquiri.cli.server for consistency. daiquiri.app just contain a link for compatibility with stuffs already installed in beamlines.