add CosmeticFilter fields

add cosmetic mask fields

add tests for parsing cosmetic rules with simple selectors

implement is_simple_*selector methods

Finish cosmetic filter parsing implementation

The only thing missing from here is CSS rule validation. Generally, a
DOM is used for that purpose in Javascript-based implementations.

break rule parsing after '#' separator into separate function

remove support for `script:inject()`

It appears that `script:inject()` is no longer in use; the newer `+js()`
syntax is preferred.

Ref: https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#scriptlet-injection

reduce code duplication in tests

add tests for hostname parsing

add tests for href selectors

The Cliqz implementation does not flag `href$=` selectors, so I've left
those unflagged as well.

add tests for entities

as well as fixes for associated logical errors

add tests for injected scripts

add style specifier tests

add tests for unicode and unsupported syntax

disallow unhide and script inject rules without hostname constraints

prevent generic style rules

prohibit double-negated cosmetic filters

remove href flag from cosmetic filters

Rather than pulling in an entire CSS styling library as a dependency,
this ensures that the syntax of supplied CSS selectors is valid, without
concern for the textual content of individual tokens. As new
pseudo-selectors are added to the W3C spec, this implementation should
still function as intended.

add tests for bad CSS selector inputs

protect against urls appearing in `:style()` filters

See uBlockOrigin/uBlock-issues#668

add tests for matching util functions

add tests for cosmetic filter matching

use iterators instead of loops during matching

document cosmetic filter rule matching functions

rename hash lists in cosmetic filter matching function

update matching algorithm for batch queries

simplify test matching implementation

add selector to key convertion tests

Currently, `escaped_characters` and `escape_codes` fail because there is
no handling for these at the moment.

add key to existing tests

store complex selector strings instead of entire rules

add function to allow retrieving rules for new classes and ids

…esheet

harden CosmeticFilterCache thread safety across FFI

add struct for keeping track of exceptions per-hostname

add type for returning information specific to a hostname

…t injects

tests for exceptions and base stylesheet

fix hidden_generic_rule implementation

add tests for hidden generic rules

add tests for style and script inject exceptions

tests for class and id stylesheets with exceptions

return a single injectable script instead of a Vec