Stealth: CSS Optimizer Integration

[cookiengineer]

The CSS Optimizer needs to be integrated and offer a default set of blocked CSS properties, rulesets and conditions. What is to be blocked shall be a simple BLACKLIST-like functional format that should be a list of property names and their functions that should filter out the CSS per-rule(?) or per-element(?).

Currently it is unclear how to implement a per-element parser without a DOM model on the stealth-side, which is therefore dependent on the implementation of the HTML Optimizer that should come first.