[FR] Add base class selection when adding new Component

If you add a new Component, the Projucer creates a nice boiler plate.

It would be great, if you could specify a parent class, so the Projucer would add all pure virtual methods as stubs, or maybe with a toggle to have all virtual methods as stubs.

This saves some typing, and also helps if IDEs only show, that a class is abstract, but don’t tell, which method is missing (XCode e.g.)
This is not only helpful for Components, but also e.g. for ValueTree::Listener, which has a lot of pure virtuals.