Implement pointlights

[vlj]

This PR adds point lights support to OpenGL and Vulkan backend for terrain high settings and instanced lit object.

Description

This adds support for per pixel (not lightmap based) point lights that behaves "correctly" with normal data in the scene.

This is a rough implementation of the "Clustered Forward Shading" technic used in forward renderer like warzone renderer.
The idea is to split the view frustrum in small bucket and build for every bucket a list of all lights intersecting this bucket. Then in the fragment shaders, the fragment will query the right bucket depending on the screenspace location.

The assumption is that point lights are often very local, and thus it doesn't make sense to run the light computations on all visible lights for every pixel in the scene.

Due to the demanding nature of the technic it is enabled only for instanced meshes rendering and high details terrain.

For now there is a limit of 128 different "frame" lights, and the accumulated size of bucket light is 512, and there are 64 buckets.

Help needed

Testing

The best map for quick test is the beginning of the beta campaign, with a lot of lights. Note that the first time when the VTOL are bombing the base in this mission, some point light disappear for a brief moment due to the amount of light.

After a toggle is introduced in the settings menu (currently I only tested by recompilation), I need tests to see if the legacy codepath still works.
I need tests to see if it works on various config, with and without the toggle enabled.

[ManManson]

Mostly minor changes suggested, like forgotten const& to avoid excessive copying, std::move, mismatching iteration types and some spelling typos (like "frustrum" vs "frustum").

[MaNGusT-]

looks like yellow light in blows or when vtol is destroyed still uses non-point light