textproc/py-parsel: Update to 1.10.0

Convert to PEP-517.

Undeprecate consumers.

The Scrapy framework has been devided amongst several maintainers,
including myself, which isn't an ideal situation. textproc/py-parsel,
being part and parcel (pun intended) to the whole operation hasn't been
updated in ~6 years. This port is well past its EXPIRATION_DATE, with no
maintainer input, so I figure all is fair at this point to save Scrapy.