[IMP] event: remove automatic date_end assignation based on
date_begin; also quickly fixed view of event locations.
[IMP] event: new kanban view. New! Shiny! With popcorn!

Added two features in kanban view
- having a data-routing attribute on the oe_kanban_global_click
container allow to have a custom routing instead of only
'form view' / 'edit view'. This is used for example to go to
the website view of events.
- allow type=url along with object, action, ... to have some specific
urls for links.