[ticket/13005] Add event to display_forums() to modify category template data

While there're events to modify/add FORUM_POST/FORUM_LINK template data,
such an event is missing for FORUM_CAT forum type.

PHPBB3-13005
[ticket/13006] Add variables to the 'core.modify_quickmod_actions' event

Add $quickmod and $action variables
for the 'core.modify_quickmod_actions' event trigerring
to avoid of using global operator in corresponding extensions.

PHPBB3-13006
Merge pull request #2903 from rxu/ticket/13006

[ticket/13006] Add variables to the 'core.modify_quickmod_actions' event

* rxu/ticket/13006:
  [ticket/13006] Add variables to the 'core.modify_quickmod_actions' event
Merge pull request #2901 from rxu/ticket/13005

[ticket/13005] Add event to display_forums() to modify category template data

* rxu/ticket/13005:
  [ticket/13005] Add event to display_forums() to modify category template data
[ticket/13057] Add $phpbb_dispatcher to the global in mcp/mcp_report.php

PHPBB3-13057
Merge pull request #2944 from Nicofuma/ticket/13057

[ticket/13057] Add $phpbb_dispatcher to the global in mcp/mcp_report.php

* Nicofuma/ticket/13057:
  [ticket/13057] Add $phpbb_dispatcher to the global in mcp/mcp_report.php