New module product_template_attribute
product_attribute provides a set of attributes per template and attributes are
introduced in the variant. It is very common for companies to have something similar
to this but with categories <-> templates instead of templates <-> product.
Typical examples include most online shops, such as sales of domestic appliances,
computers, etc. With categories like "TV", "Console", "Fridges", etc. All those will
need to share the same attribute set (Inches, SmartTV (yes/no), ...) while being
different templates (different name, prices, suppliers, ...).