Temporal AA sharpening

[John_Alcatraz]

@hallatore;751608

I think it should work. Just turn on r.ShaderDevelopmentMode=1 in Engine/Config/ConsoleVariables.ini so you see what it’s complaining about.

The code is pretty basic, so I don’t see what would have changed between 4.15 and now.

Its more than 200 lines of changes, so a lot of stuff can have changed there between 4.15 and 4.18.