add site profiling

[KonoromiHimaries]

gorhill#3651

example rule using on dobreprogramy
https://www.dobreprogramy.pl/uBlock-Origin,Program,Windows,70683.html

---

!#if load_this_rule_if_it_does_not_detect_element_on_that_site(rule:"###phContent_spanOtherLinks")
dobreprogramy.pl###nnixt

if the rule does not detect the element ###phContent_spanOtherLinks, it will load the element ###nnixt
thats all

[jspenguin2017]

This is really difficult to implement, and can't you accomplish it with extended procedural matcher?