nv2a: Improve inverse viewport z scaling and clipping

[mborgerson]

Fixes some depth issues.

• Fixes Serious Sam: Items are rendered through geometry that should occlude them #802
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• Fixes Driv3r | Skybox is visible at all times, weird character lighting #891
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• Fixes depth issues mentioned in Meta : Z ording issues #1016 for Driv3r, Chicago Enforcer, and maybe more
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• Fixes an issue with Halo 2 cutscene DoF effect (but not other depth issues in game--cause of which is known but pending)
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• Test macOS to make sure it's not crippled by change Performance is apparently unaffected.

[Triticum0]

Fixes

• Driver: Parallel Lines
• IndyCar Series
• IndyCar Series 2005
• Oddworld: Munch's Oddysee
• Tron 2.0: Killer App

the other games are not fixed or I haven't tested them.

Untested

• Splinter Cell Pandora Tomorrow (Tested Tom Clancy's Splinter Cell)
• Tom Clancy's Rainbow Six 3 (Tested Tom Clancy's Splinter Cell)
• Tom Clancy's Rainbow Six 3 Black Arrow (Tested Tom Clancy's Splinter Cell)
• Tom Clancy's Ghost Recon: Advanced Warfighter (Tested Tom Clancy's Splinter Cell)
• Knight's Apprentice: Memorick's Adventures (Need an amd card to test)

[Fabxx]

tested on splinter cell, does not fix depth issues yet

[LeRutY]

Unfortunately it doesn´t fix the issue in Rainbow Six 3 and Ghost Recon Advanced Warfighter