Rename cmakemanager -> kdevcmakemanager

Consistency++
CMakeLists.txt use new cmake library syntax

eg: use KDev::Shell instead od ${KDEVPLATFORM_SHELL_LIBRARIES}

REVIEW: 120249

Signed-off-by: Laurent Navet <laurent.navet@gmail.com>
fix knewstuff3 include

knewstuff3 -> kns3

Signed-off-by: Laurent Navet <laurent.navet@gmail.com>
fix qthelp target_link_libraries

add KF5::KI18n where needed
documentation/qthelp: fix build problem

CMakeLists.txt:
-add KDELibs4Support
-fix typo (KI18n->I18n)
qthelpconfig.cpp
-fix knewstuff3 include

Signed-off-by: Laurent Navet <laurent.navet@gmail.com>