[prep-release-3.0.12] Bumping version number for 3.0.12-RC3.
[prep-release-3.0.12] Update Changelog for 3.0.12-RC3 release.
[ticket/11829] Use report_closed to determine status in MCP report_details

Instead of using post_reported of the post or message_reported of the pm, use
report_closed of the report itself to reliably determine whether this
particular report is closed or not in the report_details view of the MCP.
This fixes a bug where the report_details view would not show that the report
shown was closed and display a "Close report" button that had no effect.

PHPBB3-11829
Merge branch 'prep-release-3.0.12' into develop-olympus

* prep-release-3.0.12:
  [prep-release-3.0.12] Update Changelog for 3.0.12-RC3 release.
  [prep-release-3.0.12] Bumping version number for 3.0.12-RC3.

Conflicts:
	phpBB/includes/constants.php
	phpBB/install/database_update.php
	phpBB/install/schemas/schema_data.sql
[ticket/11831] Update fabpot/goutte to 1.0.*

PHPBB3-11831
[ticket/11831] getAttribute was replaced with attr

PHPBB3-11831
[prep-release-3.0.12] Remove changelog entry for ticket that was not resolved.

A wrong fix version was assigned to PHPBB3-11288.
Merge branch 'prep-release-3.0.12' into develop-olympus

* prep-release-3.0.12:
  [prep-release-3.0.12] Remove changelog entry for ticket that was not resolved.
Merge pull request #1698 from rechosen/ticket/11829

[ticket/11829] Use report_closed to determine status in MCP report_details
Merge pull request #1701 from EXreaction/ticket/11831

Update fabpot/goutte