Allow user to delete a project or database

[saidelike]

Friend-issue of https://github.com/IDArlingTeam/IDArling/issues/88

Would be nice to be able to delete a project or database when we think we don't need it to avoid "noise" in the listing.

It could either delete all the entries / databases, etc. from the server side, or just leave them if you think it is better, but would not show them anymore on the user client part.