* special characters in sites.json
*Move to sites_custom.js: Orlando Sentinel (151,000 daily prints), Sun-Sentinel (163,000) San Diego Union-Tribune (121,000), The News-Gazette, The Morning Call, mexiconewsdaily, L.A. Business Journal, baltimore sun, Crain's Chicago Business, l'écho, Winston-Salem Journal, Eindhovens Dagblad, The Examiner, etc.
* remove the two screenshots & changelog.txt (obsolete)
* instructions for Opera/Vivaldi/Brave/Chromium browsers & link to Firefox
* Updates README.md
Block paywall-scripts like TinyPass/Piano (Economist, Spectator, Foreign Policy etc.) and Poool.fr (Challenges.fr).
New seperate option for these scripts (or in future always by default?).
Less maintenance because defaultSites are obsolete (in background/options.js).
Domains by default are added to allow/remove_cookies (just a few allow_cookies entries are left).
Custom sites for smaller sites and quick updates (json-file read directly from GitHub repo).
