Use RWTexture2D.operator[] in favor of RWTexture2D.Load

[magcius]

Load doesn't exist in a PSSL environment, but operator[] does.

[fstrugar]

There seems to be differences in the .Load vs .operator[] approach - they produce different DXBC / ISA. Here's what it looks like: dxbc-new.txt dxbc-old.txt isa-new.txt isa-old.txt

I don't have time to validate the changes right now unfortunately and I don't want to just change it and possibly break someone's code.

Perhaps putting the operator[] under #ifdef-s might be easiest for now?