Improve Integration with Cospend Server

I started creating a few projects backed by a Cospend server instance and sharing them with my girlfriend. However, problems occurred related to one of us not being able to modify the project (e.g., adding additional project members). I stumbled upon an issue for the iOS app PayForMe (https://github.com/mayflower/PayForMe/issues/36) which seems to explain the reason behind this.

Am I correct to assume that MoneyBuster also uses the "participant" access level by default? It would be awesome if this could be reflected in the app somehow or even better, made configurable.

Is it possible to query the access level from a Cospend instance? If so, the app could deactivate options that are not accessible with the current level (add users, modify remote project name, ...).

For users with high-enough access level it would also be great if remote project deletion was possible. Furthermore, sharing a project with other users of a nextcloud instance would be another great integration (I thought this was what you were talking about in #42 but maybe I misunderstood the account list stuff).

Potentially, this could be split into multiple issues but I didn't want to spam too much. Feel free to seperate it if you think that's more useful. And thank you for making a great self-hosted application more accessible by providing an already awesome Android app :).