Heavy refactoring of Query logic, new metric dimension picker

frontend/src/metabase-lib/lib/Dimension.js

frontend/src/metabase-lib/lib/Question.js

frontend/src/metabase-lib/lib/Question.spec.js

frontend/src/metabase-lib/lib/metadata/Database.js

frontend/src/metabase-lib/lib/metadata/Field.js

frontend/src/metabase-lib/lib/metadata/Metric.js

frontend/src/metabase-lib/lib/queries/Aggregation.js

frontend/src/metabase-lib/lib/queries/AtomicQuery.js

frontend/src/metabase-lib/lib/queries/MultiQuery.js

frontend/src/metabase-lib/lib/queries/NativeQuery.js

frontend/src/metabase-lib/lib/queries/Query.js

frontend/src/metabase-lib/lib/queries/StructuredQuery.js

...tend/src/metabase-lib/lib/queries/StructuredQuery.spec.js

frontend/src/metabase-lib/lib/utils.js

frontend/src/metabase/css/core/colors.css

frontend/src/metabase/meta/types/Card.js

frontend/src/metabase/meta/types/Query.js

...rc/metabase/qb/components/actions/CommonMetricsAction.jsx

.../src/metabase/qb/components/actions/CountByTimeAction.jsx

...tend/src/metabase/qb/components/actions/PivotByAction.jsx