Use a more space efficient data structure for rules

[jayvdb]

The current dict is very fast, but requires all hostnames are in memory. A btree of the reversed hostname would be better.

[jayvdb]

https://pypi.org/project/surt/ is at least sort efficient, and could be the structure of the components used and stored in the btree.

A similar one seen was called "lru" (reverse of url)