* Windows: Updated Qt to 5.15.7.
* Windows: Compile with GCC 11, and updated all
  included dlls.
* Windows: Fix crashreporter not including source
  files and line numbers. Use SymGetModuleInfo64
  and friends instead of libbfd.
* Manual: Remove some external links that could
  make the web browser crash. (qtwebkit must be
  patched manually to prevent it from trying to
  load plugins, it's easier just removing links
  to external web pages.
* S7: Updated 10.0 / 9-Dec-2021.