Finish QueryProcessor

[steve-hickman-epistimis]

com.epistimis.uddl.generator.QueryProcessor takes queries specified using the UDDL Query syntax and processes them. uddl.epistimis.uddl.query already has the parser to convert them to an AST - but that info still needs to be converted from (possibly qualified) names that reference a UDDL model to actual model reference links - and the appropriate model navigation and cardinality analysis.

Note that queries have the same syntax whether referring to Conceptual, Logical, or Platform level model entities - so the QueryProcessor should be a generic base class, with derived classes for each level.