Fix the hole in atmosphere when looking into horizon from the ground level

[EMaksymenko]

We need to fine tune atmosphere logic to avoid this black hole appearance when camera is looking into horizon from ground below sea level.

[EMaksymenko]

There is ni more hole, but back artifacts dynamically appears on horizon when looking parallel to the ground on low altitudes.

[EMaksymenko]

This is a depth precision issue. When near plane is very small to not cut terrin on low altiude its precision on horizon is very poor. It cause this effect of incorrect vertex rendering by atmosphere.
Issue will not appear if ner plane calcualtion will be limited by minimum 10m terrin altitude.

to fix this issue all depth should becom logarithmocal in all shders. Otherwise either horiaon artifact will be visible or terrain will be cut from below in VR mode form camera altitude 1.7m. No other solution will solve this problem.