rhi: Add support for half precision vertex atttributes
Runtime support is indicated via QRhi::Feature::HalfAttributes. OpenGL support is available in OpenGL 3.0+, OpenGL ES 3.0+, and in implementations that support the extension GL_ARB_half_float_vertex. Other RHI backends (Vulkan, Metal, D3D11, and D3D12) all support this feature. Note that D3D does not support the half3 type. D3D backends pass half3 as half4. tst_qrhi auto unit test included. Change-Id: Ide05d7f62f6102ad5cae1b3681fdda98d52bca31 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
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