Countdown: add a capability to decide who can Create
Summary:
This change adds the `countdown.create` capability to
allow to limit countdown creation.
This change comes from the Wikimedia Phabricator and
was originally proposed by v.bozzolan and implemented
by the kind user 20after4.
https://phabricator.wikimedia.org/T258599
Closes T15208
Ref T15081
Test Plan:
- go to the page /applications/view/PhabricatorCountdownApplication/
- play a bit with the "Can Create Countdowns" option
- note that it is respected
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: speck, tobiaswiese, Matthew, Cigaryno
Tags: #countdown, #policy_archived
Maniphest Tasks: T15208, T15081
Differential Revision: https://we.phorge.it/D25101
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