Add dialog default state

Mike Kowalskirequested to merge
mkov/inkscape:set-default-dialogs into master

Adding default dialog state that can be used to configure some dialogs after fresh Inkscape installation.

Right now added docked Fill&Stroke dialog and Layers dialog as well as designate some dialogs to open floating by default.

To test it, delete ~/.config/inkscape/dialogs-state-ex.ini file.

Also taken care of warning in dialog container complaining about no "Windows" group in INI file. It is a known expected state (empty), so testing for it explicitly to prevent exception.

Edited by Mike Kowalski

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