0.13 release
    
    Improve performance of the code injection. See the bachelor thesis of Martin Zmitko (https://www.vut.cz/en/students/final-thesis/detail/147218) for more details.
    
    * The code is no longer generated in the background due to the latency of passing huge messages from
      background to content scripts.
    * Optimize injection code size (remove duplicate code).
    * Do not generate xray wrapper when in Chromium-based browsers.