CMake configuration is too platform-dependent and potentially broken

[JayFoxRox]

This differentiates MSVC and non-MSVC, when, for the most part, it probably shouldn't have to be this way:

TrackRender/CMakeLists.txt

Lines 9 to 19 in 3dbbce0

	if(MSVC) # assumes vcpkg
	find_package(jansson CONFIG REQUIRED)
	find_package(PNG REQUIRED)
	find_package(embree 3 REQUIRED)
	find_package(assimp CONFIG REQUIRED)
	link_directories(${EMBREE_ROOT_DIR}/lib)
	set(JANSSON jansson::jansson)
	add_definitions(/D_USE_MATH_DEFINES /DNOMINMAX /wd4305 /wd4244 /wd4996)
	else()
	set(JANSSON jansson)
	endif()

Most (all?) packages are probably also required on non-MSVC.
This will hinder portability.

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In addition, none of those packges are actually used / linked within this projects CMakeLists.txt.

I assume that the dependencies will take care of linking them, but in that case, this project shouldn't even have to be aware of these libraries (instead, the dependency should pull them in).

[X123M3-256]

The MSVC stuff was added by @janisozaur. I can't say I understand CMake well enough to address this issue, but I do know that all of those packages are required by this project.

[JayFoxRox]

I might send a PR about this (and unresolved CMake stuff from #5) in the future; remind me if I don't. However, I probably won't get to it before January, so hopefully someone else picks it up before then.