Allow explicit fix target selection with ∈ (element of) operator

[Dakon]

I would like to be able to specify if a fix statement applies to the inner, outer, or both element when matching with the ∈ operator.

Example:

node[foo=bar][baz] ∈ way[highway]
{

fixRemove[inner]: "foo";
fixAdd[both]: "bar=yes";
fixChangeKey[outer]: "highway=>barrier";

}