recurrence: Add recurrence struct to parse recurrence-rules
Currently, gnome-calendar has no component to deal with recurrence-rules of events. This missing component is however required to create and modify recurring events. This patch adds the required GcalRecurrence component which parses the recurrence-rules with details like: * Frequency of the recurring event * Duration of the recurrences: ** If they repeat until a particular date ** If they repeat a fixed number of times ** If they repeat forever and then stores these details in a suitable format in the GcalRecurrence structure. The gcal-recurrence functions simplify the task of handling and editing recurrences. This structure is the first step towards creating a new 'recurrence' property of an event. https://bugzilla.gnome.org/show_bug.cgi?id=782755
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4b4b8d23