Add missing operators. Emplace on optional does not want to work in GCC. #1076

Job	Run time
build-mac-native (macos-13)	8m 32s
build-mac-native (macos-14)	4m 22s
build-unix-native (ubuntu-20.04, libgl1-mesa-dev libxkbcommon-x11-0 libpcre2-16-0 qt5-default, qm...	5m 26s
build-windows (windows-2019, true, YUView-Win2019.zip, qtBase_6.7.2_win2019.zip)	10m 41s
build-unix-native (ubuntu-22.04, qt6-base-dev, qmake6)	5m 18s
build-windows (windows-2019, false, YUView-Win2019-noautoupdate.zip, qtBase_6.7.2_win2019.zip)	10m 25s
build-unix (ubuntu-20.04, qtBase_6.7.2_ubuntu20.zip, libde265.so, libde265-internals.so, YUView.U...	6m 43s
build-unix (macos-13, qtBase_6.7.2_mac13.zip, libde265.dylib, libde265-internals.dylib, YUView-Ma...	7m 1s
build-unix (macos-14, qtBase_6.7.2_mac14.zip, libde265.dylib, libde265-internals.dylib, YUView-Ma...	3m 5s
	1h 1m 33s

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