These are only really useful to kdoctools, so they may as well live
there.

REVIEW: 115897

 * define imported targets for all components
 * add version information
 * print message on Windows
 * add package properties
 * use handle components

REVIEW: 116046

Inspired by the FindXCB module it's using components to simplify
finding just the parts which are really required.

REVIEW: 116018

This module finds the egl library through pkg-config.

REVIEW: 116014

This will be available in CMake 3.0.0.  This way, we automatically pick
up any new features from it.

REVIEW: 115775

All the frameworks are ported now, so this is no longer necessary.
Checked by building everything with kdesrc-build.

Now that we no longer have to support the old syntax, some of the
more complex bits of the argument parsing can be removed.

REVIEW: 115869

Overriding a CMake package like this will just cause all sorts of
headaches later on.  In this particular case, projects that depended on
CMake 2.8.13 or later (more likely 3.0.0) would fail with a message
about removing the CMakePackageConfigHelpers file, but would have no way
to do that while still using ECM.

This also renames the configure_package_config_file() macro to
ecm_configure_package_config_file(), so that anything including
CMakePackageConfigHelpers afterwards does not overwrite the macro
unexpectedly.

For now, we keep a CMakePackageConfigHelpers.cmake file that just wraps
ecm_configure_package_config_file() as configure_package_config_file()
to keep the frameworks building while they are ported.

REVIEW: 115496
Reviewed by Sune Vuorela <kde@pusling.com>

[at least everything that kdesrc-build builds. If there's something else,
then it should be added to kdesrc-build...]