Release 0.10.0

  - treewide: Allow Qt6 build to be configured via CMake.
  - libqmenumodel/src: Fix build errors with Qt6.
  - {libqmenumodel/src,tests/client}: Fix warnings with Qt6.
  - libqmenumodel/QMenuModel/CMakeLists.txt: Omit API version from
    QMenuModel module name when building Qt 6 variant.
  - libqmenumodel/src/CMakeLists.txt: Ship Qt 5 and Qt 6 includes in
    different paths; eases packaging.
  - tests: Increase test timeout.
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