Add conversion function for int and tests for all #1054

Job	Run time
build-mac-native (macos-13)	5m 15s
build-unix-native (ubuntu-20.04, libgl1-mesa-dev libxkbcommon-x11-0 libpcre2-16-0 qt5-default, qm...	4m 24s
build-mac-native (macos-14)	3m 0s
build-unix-native (ubuntu-22.04, qt6-base-dev, qmake6)	4m 23s
build-windows (windows-2019, true, YUView-Win2019.zip, qtBase_6.7.2_win2019.zip)	7m 28s
build-unix (ubuntu-20.04, qtBase_6.7.2_ubuntu20.zip, libde265.so, libde265-internals.so, YUView.U...	6m 14s
build-windows (windows-2019, false, YUView-Win2019-noautoupdate.zip, qtBase_6.7.2_win2019.zip)	7m 8s
build-unix (macos-13, qtBase_6.7.2_mac13.zip, libde265.dylib, libde265-internals.dylib, YUView-Ma...	5m 21s
build-unix (macos-14, qtBase_6.7.2_mac14.zip, libde265.dylib, libde265-internals.dylib, YUView-Ma...	2m 43s
	45m 56s

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