Revival of the old VTK rendering component that was available up to VTK 8 and is missing from VTK 9 onwards.

1) Download the RADStudio12Demos (https://github.com/Embarcadero/RADStudio12Demos) and build vtk.
2) Unzip the VTKPackageRenderer.7z to \RADStudio12Demos\CPP\CMake\vtk\Examples\GUI\VCL (adjust to your location accordingly).
3) Add system path variables
VTK_lib_64x to D:\GitHub\RADStudio12Demos\CPP\CMake\build-vtk\
and
VTK_source_64x to D:\GitHub\RADStudio12Demos\CPP\CMake\vtk
(adjust to your location accordingly)
These system variables are used in VTKPackageRenderer.cbproj.
4) Open VTKPackageRenderer.cbproj in RAD Studio IDE 12.3 -> build for Win64x :-)
5) If you want to use drag and drop of the component in the IDE (v12.3, 32bit) you need a Win 32 build of the package
	a) I use a VTK 5 build for this, because it is the last VTK version I could build with bcc32
	b) Set System Path Variables VTK_lib_32 to VTK_source_32 accordingly
6) Build for Win32 -> Install component
7) For Win64 I am using VTK 7.1 and System Path Variables VTK_lib_64 to VTK_source_64 accordingly

I think steps 5-7 will be unnecessary when the 64bit IDE is fully functional.