[FEATURE] Add grouping criterias to enhance metapart concept

[turdusmerula]

Allow to automatically group parts upon some criteria inside a metapart:

For example a 10k - 0805 metapart could match all parts with :

• resistance = 10k
• footprint = 0805

And another part 10k - 0805 - 1% would match all parts with matching parameters:

• resistance = 10k
• footprint = 0805
• tolerance = 1%