(1) ensure <style/> children of <region/> are verified (fixes #1);
(2) ensure valid #RGB and #RGBA color expressions are not marked invalid (fixes #2);
(3) suppress duplicate warnings when --treat-warning-as-error applies;
(4) parameterize quoted generic font family treatment;
(5) add valid test for quoted generic font family treatment notification;
(6) abbreviate ant target run-valid-tests to run-valid, turn off verbosity, and enable fail on error;