Port build system to modular VTK era.
Add new top level modular VTK cmakelist and module.cmake files and restructure database to build in AVTAlgorithm classes into same library as databases that subclass them. Remove explicit wrapping and installation cmake commands since modular VTK takes care of it. Use VTK add library macros that old PV one was promoted too. Change to use new export macro defined by the module. Whitespace and ANNOYING_OLD_CMAKE_UPPERCASE_STYLE cleanup.
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