[pdf] remember export settings for pdf wizard page #226
This pull request improves the PdfExportWizard page. Whenever the user exports a pdf the settings are stored in a PreferenceStore. Stored settings such as
are requested if the user exports the map to pdf again. So the user doesn't have to re-configure the same settings again and again.
In addition refactored properties naming (e.g. lower to bottom)
Signed-off-by: Frank Gasdorf firstname.lastname@example.org