make line-of-sight objects aware of its subclasses #5067

Job	Run time
Windows (Debug, MSVC, Win32)	14m 48s
Linux (Debug, gcc-9)	9m 51s
Windows (Debug, MSVC, x64)	15m 22s
Mac (Debug, clang, x86_64)	7m 24s
Linux (Debug, gcc-13)	2m 11s
Windows (Release, MSVC, Win32)	18m 20s
Mac (Debug, clang, arm64)	6m 11s
Linux (Debug, clang-16)	9m 13s
Windows (Release, MSVC, x64)	19m 57s
Mac (Release, clang, x86_64)	7m 23s
Linux (Release, gcc-9)	12m 28s
Mac (Release, clang, arm64)	7m 29s
Linux (Release, gcc-13)	6m 55s
Linux (Release, clang-16)	15m 29s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	8m 6s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	7m 31s
	2h 48m 38s

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