remove libtaskmanager that creates conflicts with kwin scripting+6

--first attempt
task manager deprecated KWindowSystem in signals for kwin scripting

--in order to use the same codebase some tweaks had to been made
in order for the plasmoid to use the KWindowSystem but the
kwin script to use for the same signals the workspace object
enable closeWindow from plasmoid space
Merge branch 'test-fixes-deprecate-taskmanager' into tests-fixes