CMake: Add HEADERS_EXCLUDE_FROM_ALL to vtk_module_build

Mathieu Westphal (Kitware)requested to merge
mwestphal/vtk:module_headers_exclude_from_all into master

Projects building VTK modules can now control whether headers (and associated SDK files) are installed by default or require an explicit component request.

Edited by Mathieu Westphal (Kitware)

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