utils: add dialog to modify recurring events
Whenever a user chooses to modify an event which is recurring, a new dialog will open automatically when the user clicks 'Done' or 'Delete' in edit-dialog, after making the desired changes. This new dialog will ask the user to choose the set of events to which the changes will be applied. The options include 'This Event Only', 'Subsequent Events' and 'All Events'. The function returns true and the changes take place only if the user chooses any option other than 'Cancel' or <Alt+F4>. https://bugzilla.gnome.org/show_bug.cgi?id=782755
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3503f16b