removed tooltips configuration, improved DTextLine

--tooltips settings were removed as the default KDE tooltips
are used from now
--DTextLine (is used in the WorkareaDeleg) improved with
containsMouse etc... One small issue remains, if you assign
all the DTextLine component in the tooltips then containsMouse
doesnot work for some reason. Workaround was that an alias of
the biggest MouseArea was used as target for the tooltip
improve DTextEdit like DTextLine

--DTextEdit has been simplified a lot like DTextLine,
for some reason the same issue with tooltips occurs here also
but by using tootipItem property there are no problems
with tooltips