[MERGE] event: ease event configuration and use of tracks

This merge proposes to ease the use and configuration of events as well
as the use of event tracks and track proposals. This is done through
two main modifications

 * first one aims at improving event categories so that they can be used
   as configuration for events. Categories can now define default values
   for automated mailing, ticketing, location management, questions to
   attendees, ... Preconfigured data for event categories are added to
   help user having finely-tuned events;
 * second one aims at improve event track model. Tracks now use dynamic
   stages with automated mailing, as well as kanban state, activities
   and all common chatter features.

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