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Screen Space Ambient Occlusion (SSAO shader)

This is Screen Space Ambient Occlusion (SSAO) shader. Porting from Source SDK.

Screen space ambient occlusion (SSAO) is a computer graphics technique for efficiently approximating the ambient occlusion effect in real time. It was developed by Vladimir Kajalin while working at Crytek and was used for the first time in 2007 by the video game Crysis, also developed by Crytek.

Bugs:
1. This may have bugs with weapon bases: Coalfare Base, ARC9, ARCCW, etc. This will be fixed in the future.
2. There are currently issues with the Depth buffer. Sprites may flicker in places. This issue will be fixed.

Convars:
pp_ssao - Enable/Disable screen space ambient occlusion.
pp_ssao_quality - 32 - very hight, 16 - hight, 8 - normal, 4 - low; (1-32).
pp_ssao_debug - Enable/Disable SSAO debug.
pp_ssao_contrast - SSAO contrast (0 - 5).
pp_ssao_radius - SSAO radius (1 - 32).
pp_ssao_luminfluence - SSAO luminfluence (0-10; 0 - disabled).
pp_ssao_bias - SSAO bias (0 - 2).
pp_ssao_bias_offset - SSAO radius offset (0 - 1).
pp_ssao_custom_depth - Custom depth buffer have more bits but have no alphatest support.
pp_ssao_znear - znear depth buffer (0.01 - 100).
pp_ssao_zfar - zfar depth buffer (0.1 - 1000).
pp_ssao_debug_fp - Show debug first pass SSAO.
pp_ssao_debug_dp - Show debug current Depth buffer.

Credits:
Akabenko – porting shader from Source SDK to GMOD.
Ethan – making custom Depth Buffer.

Thansk Goldermor for porting BTR-82.