[ticket/12928] core.mcp_reports_gather_query_before

Adding the core.mcp_reports_gather_query_before
event to mcp backend.

PHPBB3-12928
[ticket/12928] Update to RC4

PHPBB3-12928
[ticket/12991] Have events after/before "add warning" field - user and post

PHPBB3-12991
[ticket/12661] Load extensions templates from "all" folder by render()

PHPBB3-12661
[ticket/12661] Add template test

PHPBB3-12661
[ticket/12661] Add new line at the end  of files

PHPBB3-12661
[ticket/12991] Correct language mistakes

PHPBB3-12991
Merge pull request #2826 from brunoais/ticket/12928

[ticket/12928] core.mcp_reports_gather_query_before
[ticket/13024] Add template event viewtopic_body_postrow_post_content_footer

PHPBB3-13024
Merge pull request #2913 from Nicofuma/ticket/13024

[ticket/13024] Add template event viewtopic_body_postrow_post_content_footer
Merge pull request #2887 from Pico/ticket/12991

[ticket/12991] Have events after/before "add warning" field - user and post
Merge pull request #2908 from Pico/t/12661

[ticket/12661] Load extensions templates from "all" folder by render()
[ticket/13032] Update Symfony Components to 2.3.19

PHPBB3-13032
[ticket/13032] Also update symfony/css-selector and pin it down.

PHPBB3-13032
Merge pull request #2917 from bantu/ticket/13032

[ticket/13032] Update Symfony Components to 2.3.19
[ticket/13034] Fix the route generated for the frontend not in the phpbb root

PHPBB3-13034
[ticket/13034] Fix unit tests

PHPBB3-13034