Refactored ProductImageColumnConverter to move opinionated property initialization into a new forceSetOpinionatedPropertiesOnMappedInstance() method.
This makes overriding and customizing the default behavior easier.
In product import, enable users to specify a label for an allowed product option value.
Moved variant option value parsing into a single new method VariantRowConverter#parseAndValidateIndividualVariantOptionValueToken() which is now invoked by both the VariantRowConverter itself as well as ProductRowConverter
Introduce support for a new, more complex syntax for variant option values where each property is explicitly specified (ex: attributeName::Shirt Color;value::Red;valueLabel::Red (Deep Red))