[FIX] crm: field opportunity_ids contains only opportunities

The field opportunity_ids and opportunity_count should only contain opportunities (and not leads).
This was confusing on the partner kanbans where the field opportunity_count included leads.
[FIX] base_action_rule: typo when committing base action rule
update, evaluate the action filter_domain, not its non-existing context.
[REV] website: new blog demo snippets

This reverts commit 7246b8105bdebdd175ca82d5018f68e15e60eb43.
[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.
[IMP]removed kanban custom css