Provide default room and studio to get started quickly in routine

[https://me.yahoo.com/a/0cuzche6znjdgqhk_3bqb6bhz9by#05069]

I think ticket 128 is an important point that could be solved in a beneficial way. I thought about this because I missed the fast startup of everything by choosing a studio from laditray. Since projects exist, I need to take two actions instead of one to get started (start studio AND project)

In the discussion, I had suggested to attribute a default room and a default studio.
The default studio could be one chosen by the user from the existing studio list.
For the default room there are several possibilities:
1) attribute a default room chosen by user to the project in case the room type doesn't match
2) always default to the first room in the studio if the room type doesn't match

In any case this needs a warning that some connections _may_ not be established as saved.