Add `vtkkwiml` module to provide external KWIML library
Add a module to provide the Kitware Information Macro Library (KWIML). For now always use a bundled copy of the KWIML source. An option to use a system-installed KWIML can be added later. KWIML provides macros for information about fundamental types (existence, size, signedness, format macros, etc.) without using any try_compile tests. VTK will be able to use these macros to enable multi-architecture builds on some platforms. We should also be able to eliminate some try_compile tests to speed up initial configuration.
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