Support DSL within Guided Rule Template editor

As part of our rules, we have DSL that has nothing to do with the template keys and were hoping that we could use DSL just like in the Guided Rules (with DSL), but we have found that no substition takes place and the source shows the actual text of the LSH of the DSL definition, rather than the RHS.

At a minimum, the option of choosing DSLs should not be included when adding a new clause to the rule, so that the user does not think it will work.

Perferably, DSLs would be able to be used if they are not linked with a template key, as in the Guided Rules (with DSL) editor.

Ideally, DSLs would be able to be used in the editor and the DSLs could define a template key to be included in the data table.