Add status to multiplayer_rooms

[smoogipoo]

Enum to support possible future expansion.

This doesn't contain the full array the client would normally use ( open, open_private, playing, ended ) because the "ended" state is difficult to handle at osu!web's end for playlist rooms.

So idle now represents ( open, open_private, ended ) and the client will figure out it from there.

[nanaya]

This adds the column at the end which I don't mind but if @peppy (or someone) cares to put it somewhere else the migration will need an ->after(...)

[peppy]

As mentioned elsewhere, open and open_private shouldn't be grouped in the same enum as playing/ended because you're losing the private state for the latter two.

But since the opening post, these have been removed so I guess it's fine.

[smoogipoo]

This adds the column at the end

I only put it there because I noticed category is already there. I imagine you can do a migration to move it around later on?

But since the opening post, these have been removed so I guess it's fine

The OP is post- that idea. I.e. it's a catch all state for all of those that have to be decided by some other method later on depending on on end date / password.