Possible plugin compatability feature

[UsefullPartBrad]

Several plugins, including data-view, use front-matter yamel to introduce variable usage. It would be neat, if variables made in the front-matter would be usable as though already declared in a block. This add the complexity though that some plugins, again like data-view, include ways of altering the front-matter declarations later in the document. [variable::newvalue]] in the case of data-view. and that would require recognition of data-view usage and accessing its variables rather than parsing on the part of this plugin. Just a thought.