Handle multiple marks

[wvengen]

A small number of products has multiple mark symbols. Currently only one is supported.

• Rename mark to marks and make it an array (for future API compatibility)
• Fully recognize and handle multiple marks

An example is Dr. Bronner's Shikakai soap teatree with ingredients:

INCI: Vitis Vinifera Juice*, Sucrose*^, Cocos Nucifera Oil* (***), Potassium Hydroxide, Olea Europaea* (***), Melaleuca Alternifolia*, Accacia Concinna (Shikakai) Nut Powder*, Citric Acid, Cannabis Sativa Seed Oil*, Buxus Chinensis (Jojoba) Seed Oil*, Tocopherols (vitaminw E), d-Limonene***. * Van biologische herkomst *** Etherische olie ^ Volgens fairtrade-normen verhandeld

and

Water, groentenª¹ 26,3% (broccoli 17,2%, erwt 2,5%, prei, ui 2,6%, spinazie), aardappelª¹, ROOMª 5,9%, maïszetmeelª, raapzaadolieª, zout, rietsuikerª, gistextract, nootmuskaatª, aroma, ª afkomstig van gecontroleerde biologische landbouw., ¹op duurzame wijze geteeld.

[wvengen]

A repitition of a single character in a mark would still be one mark, when there are different marks after each other, they are different. Then there is the bracketed notation for multiple marks (let's limit this to two note marks, as we'd need examples, e.g. would it be * (***) (****) or * (***, ****) or (*, ***, ****)?)