Merge pull request #7000 from MjnMixael/qtfred_volumetric_nebula_dialog #2208

Job	Run time
Linux (Release, gcc-9)	20m 50s
Linux (Release, gcc-13)	15m 27s
Linux (Release, clang-16)	21m 31s
Linux (Debug, gcc-13)	12m 22s
Linux (Debug, clang-16)	14m 17s
Linux (Debug, gcc-9)	16m 39s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	15m 4s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	13m 18s
	2h 9m 28s

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