Allow users to customize DLSS presets

Description

• The current issue is intense visual ghosting caused by DLSS, but only on certain presets.
• 0.4.1
• RTX 4090
• 546.33
• All games I've tested

To Reproduce
Steps to reproduce the behavior:

1. Enable DLSS on Quality
2. Observe ghosting
3. Change to Performance or UP
4. Observe reduced ghosting

Alternative:

1. Enable DLSS
2. Load DLSSTweaks with the nvngx.dll hook + registry tweak
3. Update DLSS to 3.7.0
4. Force Preset E, DLSS HUD, and enable auto exposure
5. Observe improvements (ghosting is almost entirely removed)

SUGGESTED FIX

• The ability to customize DLSS Presets would fix this. DLSS Quality and Full Resolution both exhibit this issue, whereas lower presets do not. FPS does not seem to play a role either. In other games that utilize DLSS 3.x, changing the preset through DLSSTweaks has resolved issues such as this.

Even disregarding ghosting issues, the ability to customize the preset per-game would be very good. It would allow project developers to optimize DLSS per the game's visual style and requirements. For example, this ghosting issue is very minimal in Portal RTX (with identical Remix installs), but shows up in quite a few other games.

To clarify, I'm talking about these presets:

Additional Improvement
Enable DLSS auto exposure by default. It massively reduces ghosting and improves visual quality.

Screenshots
https://github.com/NVIDIAGameWorks/rtx-remix/assets/62084776/f82efd3f-266c-43bb-8301-13481f129604

No source files, tests, or entry points are identified in the issue. Start by locating the DLSS preset and auto-exposure configuration in the RTX Remix runtime, then determine how per-game settings are stored and applied. Done means users can customize the preset per game and auto exposure behaves as specified, with the reported ghosting scenario covered by validation.