Add commandline switch to gremlin_view, to specify it is a child window.
Add commandline switch to gremlin_view, to specify it is a child window.

Allows gremlin_view to be X embedded within another window after creation
as a standalone.

The switch -c | --childwindow prevents its top window being deiconified
at every poll, a mechanism which has the effect of raising the window
and keeping it on top.

This is very undesirable if embedding within a tab widget for example,
where switching tabs should render gremlin_view hidden

Signed-off-by: Mick <42e9b8d49a07279cb832caaba75ae62c3ee30fbb@mgware.co.uk>

strahlex/machinekit,strahlex/machinekit,strahlex/machinekit,strahlex/machinekit,strahlex/machinekit,strahlex/machinekit,strahlex/machinekit