Get available desktop resolutions instead of hardcoded list about dhewm3 HOT 3 OPEN

I think it already does. According to the code, I find calls to a function that queries available resolutions, and it doesn't seem to rely on a hardcoded list of resolutions, unlike vanilla Doom 3.

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@wof8317 I'm not sure about that. My resolution is 2560x1080 and I don't see it in the list.

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It's still a hardcoded list, but (in contrast to original Doom3), it's hardcoded only in the C++ code, not in the settings UI (game data).

I'll have to think about it, I don't think populating the list based on available resolutions would be easy, as right now every entry in the list corresponds to one r_mode hardcoded in the engine.
Note that you can always use r_mode -1 (r_custom* in the menu) and set r_customHeight and r_customWidth in the console.

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