decrease Unused color category priority below every other one except Other
fixed: SyntaxConstructClassifier grays out records, DU and DU cases even though they are used somewhere
move Unused symbols classifier logic to Core project (not all tests pass yet)
fix Colorizer tests, add some for Unused category
add more tests for Unused color category
Partial fix (break existing tests)
Fix regressions
Factor tests
Merge pull request #552 from vasily-kirichenko/fix-class-graying

fixed: class name declaration grayed out even though there's default constructor usage
fixed: UnopenedNamespaceResolver does not show the smart tag on module attributes and on module function/value attributes
Merge pull request #559 from vasily-kirichenko/fix-open-namespace-on-module-attributes

fixed: UnopenedNamespaceResolver does not show the smart tag on module attributes and on module function/value attributes
Merge pull request #556 from OkayX6/fix-record-stub-gen-smart-tag-bug

Fix record stub gen smart tag bug