D9835: Bump min cmake version to 3.0

[Friedrich W. H. Kossebau]

kossebau added a subscriber: hein.
kossebau added inline comments.

INLINE COMMENTS

> CMakeLists.txt:99
>  
> -ecm_configure_package_config_file(LibTaskManagerConfig.cmake.in
> +configure_package_config_file(LibTaskManagerConfig.cmake.in
>      "${CMAKE_CURRENT_BINARY_DIR}/LibTaskManagerConfig.cmake"

@hein BTW, that LibTaskManagerConfig.cmake misses some `find_dependency()`s (+`include(CMakeFindDependencyMacro)` after this patch) for all the libs in the public interface.
Sadly cmake does not generate that itself, so one has to manually note them.
Similar possibly for the other installed cmake config files.

Cmp. e.g.
https://phabricator.kde.org/source/plasma-framework/browse/master/KF5PlasmaConfig.cmake.in;fab4cdd95b7ceb4e608f8e4368682fe0a589ccff$17

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D9835

To: kossebau, #plasma, jriddell
Cc: hein, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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