Refactor api events class to use external helper
Move specs from old class
Add changelog and magic string
Refactor events class to be more explicit
Remove blank line
We're filtering the events using `Event#visible_to_user?`.
At most we're loading 100 events at once.
Pagination is also dealt with in the finder, but the resulting array
is wrapped in a `Kaminari.paginate_array` so the API's pagination
helpers keep working. We're passing the total count into that
paginatable array, which would include confidential events. But we're
not disclosing anything.
* Meld the following disparate endpoints:
* `/projects/:id/events`
* `/events`
* `/users/:id/events`
+ Add result filtering to the above endpoints:
* action
* target_type
* before and after dates
