The goal is to change the version number for a new release only in
CMakeLists.txt. This is the first step.
Details:
- CMake/gen_config.cmake: this new file is included to generate the
header files config.h (private, root directory), and FL/fl_config.h
(public, can be installed). This file implements also ABI version
checks (removed from FL/Enumerations.H and with more checks).
Warnings are issued if the chosen ABI version is invalid.
- CMake/export.cmake: code to generate 'config.h' was moved to
CMake/gen_config.cmake.
- CMake/options.cmake: set default of FLTK_BUILD_FORMS=OFF + comments
- CMakeLists.txt: move generation of FL/fl_config.h to gen_config.cmake,
add API and ABI versions to CMake summary,
- FL/Enumerations.H: remove most of the version number details which
are now included in FL/fl_config.h. This needed also some doxygen
related changes.
- README.CMake.txt: improve docs of FL_ABI_VERSION and some more.
Reflect the new default of CMake option FLTK_BUILD_FORMS (OFF).
- documentation/Doxyfile.in: add FL/fl_config.h to file list. This
file is created in the build tree (and may be "installed").
- fl_config.h.in: add version number details that have been moved here
from Enumerations.H (used to generate FL/fl_config.h).
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