Various frontend compatibility tweaks

[DLMousey]

This PR's mostly just to clear down my local environment, there's a few things in here i've probably lost track of but from looking at the diff the following seems to be here;

• Return a list of scopes in GET /applications response
• Add a nullable Scopes property to the Application ViewModel to assist with contextualising
• Add a published applications endpoint
• Add an icon to the Scope entity + migration
• Add Pyromaniac middleware reference, then immediately comment out because i can't get enough of bloating my dependencies apparently

[DLMousey]

Should've guessed this would happen, pyromaniac's not available via NuGet because i'm too lazy to publish it. Caused the build to fail because it can't download the package. Removed the reference for now