Schema: allow all

[scofalik]

It should be possible to allow all elements in given element. I see it along these lines:
schema.allow( { name: '*', inside: 'elem' } );. elem chould be $root for example.

[pjasiun]

It's not enough to allow all. For instance, if one adds quote to root and then wants to add paragraph to that quote the config "Allow * inside root" will disallow adding paragraph in quote. We need "Allow * inside *":

schema.allow( { name: '*', inside: '*' } );

Also, we should be able to allow any attribute on any element.

[Reinmar]

Why do we need all this?

[Reinmar]

I'll close this as it's all part of #3784. But please answer because I need to know why we need this.