Disable projection for 360 video

~~This is essentially the opposite of #18536~~

~~We want to be able to force PROJECTION_MODE_RECTANGULAR for a properly tagged 360 source video, ideally from the LibVLC C API.~~

This will allow properly mapping the texture frame on a sphere in 3D game engines (see vlc-unity#129 (closed)). Cubemaps may be interesting as well.

Edited Nov 23, 2022 by François Cartegnie

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