Update to 3.3.63
    
    - New upstream release 3.3.63
      - Updated LZ4 for version r123
      - Added fine horiz scrolling in wave window (when using the wheel on a mouse)
        if shift pressed
      - Timescale fix for Verilator where it emits 0ps as a timescale
      - Added sample gtkwave.appdata.xml file in share/appdata
    - Install and validate appdata from F-20 onwards