separate framework version from dependencies version, to be able to increase the version in two steps at release time, so CI doesn't break

This is instead of INCLUDE_INSTALL_DIR and INSTALL_TARGETS_DEFAULT_ARGS,
which will lose the "KF5" suffix from the include path.

Ported with:
sed -i -e 's/\(include(\)CMake\(PackageConfigHelpers)\)/\1ECM\2/' \
       -e 's/\<\(configure_package_config_file\)/ecm_\1/' \
       CMakeLists.txt

See http://commits.kde.org/extra-cmake-modules/139f60d81653888f696ef433

The only thing that was using it was a preprocessor branch in
kkeysequencewidget.cpp, which only had branches for Mac and X11.  The
restriction to those two was because it originally used KKeyServer to
get the modifier names, and that was only implemented for X11 and Mac.
This is no longer relevant.

REVIEW: 115024

REVIEW: 115087

REVIEW: 115023

We should not depend on the fact that KDECompilerSettings.cmake happens
to include it when we use generate_export_header().

Install them in the proper directory.
Let cmake find them.

Perl rocks.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
techbase wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://community.kde.org/Frameworks/GitOldHistory

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, kdelibs frameworks branch, at commit
162066dbbecde401a7347a1cff4fe72a9c919f58