[IMP] event: ease event configuration and management through categories

This commit improve event.type (Event Categories) model and views in order
to ease event configuration through more detailed categories. The purpose
is to be able to define categories holding default data for website,
tickets, attendee mailing, ... Choosing a category on a new event takes
those default values to help users creating finely-tuned events.

Main configuration on event.type is

 * auto confirmation, replacing the old system-wide auto confirmation
   parameter
 * seats limitation
 * location: online events, timezone
 * communication: reply-to email address, twitter hashtag, automated
   mailing of attendees
 * ticketing
 * website parameters: display on website, display tracks, allow track
   proposal
 * question to attendees

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