Rename parts table args

[ducky64]

Changes parts table footprint_spec -> filter_footprints, footprint_area -> filter_area, with deprecation path.

These less common parts are changed without deprecation paths:

• For GenericCapacitor, GenericResistor, replaces footprint_spec with filter_footprints.
• For CustomDiode and CustomFet, removes the manufacturer_spec and replaces part_spec with part (to unify with parts table parts). Replaces footprint_spec with part_footprint, since it is not doing selection.
• For the MAX98357, replaces the footprint filter and parts table infrastructure with a simple part field. Future multi-variant infrastructure may add back footprint filtering infrastructure.
• For Lp5907, replaces footprint_spec with filter_footprints.

Resolves #528