Provide a debug build of cimgui.dll

[joebobmiles]

I realize that this would require a major infrastructure change for how your project works, but I, like a bunch of people here, have run into an AccessViolationException (#165). When I tried to debug the issue in Visual Studio, I found that the cimgui DLL provided with the NuGet package does not have debug symbols.

Can we start a discussion on how to provide a debug build of cimgui with ImGui.NET?