Cheesecake: DataSource section/item change fixes

This release ensures that DataSourceChange and DataSourceSectionChange instances are collected in a specific order and provided to listeners in that specific order so they can be processed in that order, instead of being in an unordered Set. This is necessary to avoid collisions where some change sets could affect an object twice, and in those instances, actions need to happen in a specific order or else you'll end up with runtime errors.