Export and import layout option configuration

[soerendomroes]

I am often in the situation where I want to just look at the layout of the graph instead, hence I hide as much text as possible in the drawing via synthesis options.

If I want to edit again, I would have to enable everything that shows me that is actually done, again.

I propose a bookmark feature for synthesis configurations in which I would save and restore the options for my different working modes.