libre/iceweasel: Update to 100.0, upstream changes
    
    Update patches for some notable changes:
    1. about:devtools has been removed upstream, see [1]
    2. security.pki.crlite_mode property value has been changed to 3 by
       default by upstream, but we still disable it. This disablement is
    still up for discussion, please refer to the appropriate commit message
    from 9001-FSDG-sync-remote-settings-with-local-dump.patch
    3. Remove promos of Firefox Focus and Klar from Private Browsing page
       which appeared in this release (Klar for Germany, Focus for other
    locations)
    
    Also update existing patching of "More from Mozilla" anti-feature to
    actually remove SVG files with QR codes that lead to nonfree software.
    
    [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1609100