[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/12765] Use db_tools instead of generating queries at moment

PHPBB3-12765
[ticket/12765] Execute query directly from db tools

PHPBB3-12765
[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
[ticket/12969] Add template events around username link on composing pm

Add template event before/after find username link on composing pm
to allow extensions perform additional actions on user finding.

PHPBB3-12969
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
[ticket/13031] Only use mimetype guesser guess if it helps us

If we already have a mimetype and the guesser's guess is the default fallback,
we should keep the already existing mimetype the browser supplied. Otherwise,
platforms that might not support mimetype guessers will cause us to always
have the mimetype set to application/octet-stream on images. This will prevent
users from uploading images.

PHPBB3-13031
Merge pull request #2917 from bantu/ticket/13032

[ticket/13032] Update Symfony Components to 2.3.19
[ticket/12852] Make get_url_parts handle get variable with no value

PHPBB3-12852