This is a RFC to implement comment#2 in tdf#89130: Add
shortcuts to change layer attributes and make the current
attribute values visible in the tab layer name.

Already implemented is that pressing LeftMouse+Shift
toggles layer visibility. When a layer is not visible
its name is displayed in blue.

This patch adds that pressing LeftMouse+Ctrl toggles
layer locked/unlocked and LeftMouse+Ctrl+Shift toggles
layer printable/not printable.

The name of a locked layer is displayed italic. The name
of a nonprintable layer is underlined.

This also adds an Undo action for all changes to mirror
the behavior of the layer attribute change dialog box.

Change-Id: I5d8fa0585d4f088768716956583e324e66e29602
Reviewed-on: https://gerrit.libreoffice.org/41366Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>