Group export/import-related codes
(related to #12)
Add ability to export/import to/from file
(#12)
Add timestamp to default export file name
(#12)
Localize export/import-related strings
(#12)
Export/import to/from file in Gecko 19 and older
(#12)
Export options with platform-specific line breaks
(#12)
Override files only from writeToFile()
(#12)
Correct labels for export/import items
(#12)