Support `replace=` rule

To further improve YT ads and its counters, `replace=` support would be nice. ``` filters.txt:||www.youtube.com/playlist?list=$xhr,1p,replace=/"adPlacements"/"no_ads"/ filters.txt:||www.youtube.com/playlist?list=$xhr,1p,replace=/"adSlots"/"no_ads"/ filters.txt:||www.youtube.com/watch?$xhr,1p,replace=/"adPlacements"/"no_ads"/ filters.txt:||www.youtube.com/watch?$xhr,1p,replace=/"adSlots"/"no_ads"/ filters.txt:||www.youtube.com/youtubei/v1/player?$xhr,1p,replace=/"adPlacements"/"no_ads"/ filters.txt:||www.youtube.com/youtubei/v1/player?$xhr,1p,replace=/"adSlots"/"no_ads"/ ``` https://adguard.com/kb/general/ad-filtering/create-own-filters/#replace-modifier https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest/filterResponseData#browser_compatibility Implemented here: https://github.com/gorhill/uBlock/commit/7c3e060c01