NEW FEATURE: Implement formatoption widgets

[Chilipp]

Summary

With psyplot 1.1.0, the formatoption widget framework has been introduced
that makes it possible to implement a fmt specific widget into the
formatoptions widget of the GUI. However, this is still missing for most of the
formatoptions

Reason

It makes it faster and more intuitive to handle and update the plots through
the GUI. See also https://github.com/Chilipp/psy-simple/issues/1

Detailed explanation

For mapplot, here is the current state:

clat	clip	clon	grid_color
grid_labels	grid_labelsize	grid_settings	lonlatbox
lsm	map_extent	projection	stock_img
transform	xgrid	ygrid