getFilteredFeatures(aDontShowAgainFeatureIds, sLayer) {
			const aAllFeatures = WhatsNewFeatures.getAllFeatures();
			const aNewFeatures = filterDontShowAgainFeatures(aAllFeatures, aDontShowAgainFeatureIds);
			return filterApplicableFeatures(aNewFeatures, sLayer);
		}
Filters the new features based on the dontShowAgain feature IDs and the Flex settings
@param {string[]} aDontShowAgainFeatureIds - Array of feature IDs that should be excluded
from the What's New dialog
@param {string} sLayer - Layer for which the features should be filtered
@returns {object[]} Filtered What's New features