Release build getting closer: New feature, improvement and fixes update

This version might be the last alpha update, if everything goes alright. The number of features appears to be sufficient and stable to start the next release stage. If everything stays stable the Iridium extension might soon reach release build and be published as an extension distributed on other hosts.

A big new feature has been implemented in this version: Enable blacklist. This feature took some time to develop under the new YouTube layout, but the main goal has been reached. Some bugs might occur so please report them when possible.

Improvement and bug fixes details are included in the commit description.