Add support capturing QtQuick windows backed by Qt Rhi #126

Job	Run time
build (6.9.0, ci-dev-probe-only, false, win64_llvm_mingw, tools_llvm_mingw1706 tools_ninja, llvm-...	10m 0s
build (6.9.0, ci-dev-probe-only, false, win64_mingw, tools_mingw1310 tools_ninja, mingw1310_64, ^...	9m 55s
build (6.10.1, ci-dev-client-only, true, win64_mingw, tools_mingw1310 tools_ninja, mingw1310_64, ...	10m 55s
build (6.10.1, ci-dev-probe-only, false, win64_llvm_mingw, tools_llvm_mingw1706 tools_ninja, llvm...	9m 58s
build (6.10.1, ci-dev-client-and-ui, true, win64_mingw, tools_mingw1310 tools_ninja, mingw1310_64...	16m 5s
build (6.10.1, ci-dev-probe-only, false, win64_mingw, tools_mingw1310 tools_ninja, mingw1310_64, ...	9m 38s
build (6.9.0, ci-dev-client-and-ui, true, win64_mingw, tools_mingw1310 tools_ninja, mingw1310_64,...	16m 20s
build (6.10.1, ci-dev-client-and-ui, true, win64_llvm_mingw, tools_llvm_mingw1706 tools_ninja, ll...	17m 28s
build (6.9.0, ci-dev-client-only, true, win64_mingw, tools_mingw1310 tools_ninja, mingw1310_64, ^...	11m 9s
build (6.9.0, ci-dev-client-only, true, win64_llvm_mingw, tools_llvm_mingw1706 tools_ninja, llvm-...	10m 46s
build (6.10.1, ci-dev-client-only, true, win64_llvm_mingw, tools_llvm_mingw1706 tools_ninja, llvm...	10m 42s
build (6.9.0, ci-dev-client-and-ui, true, win64_llvm_mingw, tools_llvm_mingw1706 tools_ninja, llv...	15m 55s
	2h 28m 51s

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