ofVideoPlayer AVFoundation, setPosition can work with arbitrary frames. #1614

Job	Run time
build-msys2 (mingw64)	11m 13s
build-msys2 (clang64)	4m 26s
build-msys2 (ucrt64)	11m 42s
build-emscripten (emscripten)	3m 27s
build-android (android, armeabi-v7a)	8m 4s
build-android (android, x86_64)	8m 22s
build-android (android, arm64-v8a)	7m 10s
build-vs2022 (x64)	11m 30s
rpi-build (armv6l, armhf, arm-linux-gnueabihf, 1)	5m 56s
build-vs2022 (ARM64EC)	12m 23s
build-vs2019 (x64)	1m 7s
rpi-build (aarch64, arm64, aarch64-linux-gnu, 1)	6m 6s
build-ios-tvos (tvos, macos)	3m 3s
build-ios-tvos (ios, macos)	1m 49s
build-linux64 (linux64, 64gcc6)	3m 23s
build-macos (osx, makefiles)	2m 58s
build-macos (osx, xcode)	1m 16s
build-vs2022 (ARM64)	12m 20s
	1h 56m 15s

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