No Tonemapping in HDR

The native HDR seems fantastic in the game, except there isn't a tonemapper/display mapper present in the game and nit values are incredibly high. As a result, the game loses a lot of highlight detail to clipping on HDR displays that don't offer highlight rolloff, or if people disable it with HGIG modes (which is recommended for most software).

The HDR needs tonemapping with customizable peak brightness. Ideally, we'd get a paper white/game brightness setting as well, but peak brightness adjustment would be the bare minimum in my opinion.