Move VTK_(MAJOR|MINOR|BUILD)_VERSION out of "CMakeLists.txt" into
dedicated file "CMake/vtkVersion.cmake".  Move the preprocessor macros
from "vtkConfigure.h" to new configured header "vtkVersionMacros.h".
This avoids rebuilding everything when the version number changes.
Include the new header from the old location to provide the macros for
compatibility unless VTK_LEGACY_REMOVE is ON.

Define the BUILD version to be a date during development and the patch
level for releases (or during preparation of one as we are currently).
The CMake package version file (VTKConfigVersion.cmake) already does
this so make the C++-presented version consistent with it.  Add a
"CMake/vtkVersion.bash" script to help a nightly robot update the build
version when it is a date.  This replaces KWSys DateStamp for VTK.

Compile the wrapping parser with only the major and minor version number
components instead of the full version number.  This avoids causing a
full rebuild of all wrappers whenever t...