WIP: Extended Privilege syntax

[bwaidelich]

Extend privilege syntax to allow for custom, dedicated options:

e.g. instead of:

privilegeTargets:
  'Neos\Neos\Security\Authorization\Privilege\EditNodePrivilege':
    'Neos.Demo:EditBlogNodes':
      matcher: 'default:blog'

this would allow for:

privilegeTargets:
  'Neos\Neos\Security\Authorization\Privilege\EditNodePrivilege':
    'Neos.Demo:EditBlogNodes':
      contentRepository: 'default'
      subtreeTag: 'blog'

[bwaidelich]

This is a rabbit hole..
Maybe we can come up with a minimal version that just allows to specify dedicated target options but I close this one for now