HDR Rendering support

I've really enjoyed playing through the port. After reading your stance on feature requests, I felt this would fit right in and feel right at home for a PC port. The game itself has beautiful scenery and incredible lighting and I feel that would only be elevated if the game could output in HDR (for those folk who happen to have a monitor or TV that supports it).

I think that even after 17 years, this game looks breath taking, and I feel like this very small QoL enhancement would round out the port in a very nice way; adding a level of polish that could probably compete with an official port (should SEGA ever decide to get on that). I think this port is absolutely incredible and it runs great.

BTW, this isn't necessary and I understand if the decision is made not to support this feature or leave it on the backburner until other more pressing issues are addressed.

The issue does not name files, tests, or rendering entry points. Start by locating the rendering and display-output path, then research HDR support requirements for the port's target platforms. Done means HDR output works on supported monitors or TVs without regressing standard display output.