[ticket/11345] Change font for buttons

Change font to Open Sans

PHPBB3-11345
[ticket/11345] Add Droid Sans as fallback font

PHPBB3-11345
[ticket/11345] Move css import to template

PHPBB3-11345
[ticket/11345] Wrap remote webfonts in S_ALLOW_CDN.

PHPBB3-11345
[feature/plupload/deps] Adding parts of plupload_1_5_7.zip

PHPBB3-10929
[feature/plupload/deps] Add information about Plupload to AUTHORS.

PHPBB3-10929
[ticket/11345] Don't include scheme, so HTTPS is used where necessary.

PHPBB3-11345
[ticket/11786] Fix typo and ugly English in the notification system PHPDoc

The notification system contained two PHPDoc lines that needed improvement.

PHPBB3-11786
[ticket/11786] Fix PHPDoc documentation of a few events

Fixed some PHPDoc errors I noticed while working on the karma extension.
Mostly spacing issues or omitted characters, though there was one description
that made no sense at all.

PHPBB3-11786
[ticket/11786] s/@return void/@return null in content_visibility.php

The file phpbb/content_visibility.php still contained a few instances of
'@return void' in its PHPDoc blocks, fixed. Thanks to JoshyPHP for reporting.

PHPBB3-11786
[ticket/11786] Further improve wording in phpbb/notification/type/quote.php

Further improve wording in phpbb/notification/type/quote.php per suggestion of
imkingdavid.

PHPBB3-11786
[ticket/11621] Remove mysql extra indexes

Remove post_text index as post_content index is sufficient to search post
text.

PHPBB3-11621
[ticket/11850] Fix $user->page on pages through the controller

PHPBB3-11850
[ticket/11850] page_name contains controller request rather than query string

Fixing tests

PHPBB3-11850
[ticket/11850] Add test for outside of the phpBB directory

PHPBB3-11850
[ticket/11850] Fix extract current page test

PHPBB3-11850
Merge branch 'develop' of git://github.com/phpbb/phpbb3 into ticket/11786
[ticket/11786] Fix indentation in the PHPDoc of core.group_delete_user_before

The core.group_delete_user_before event had bad indentation in its PHPDoc.
Fixed.

PHPBB3-11786
[ticket/11862] Correct var names in user_delete() events due to prune-users

The prune-users feature modified the names of the used variables in this
function. However, the variable names for the two events in this function
were not changed to reflect that. This patch will take care of it.

PHPBB3-11862
[ticket/11691] Stagger the convertion of soft delete updates

PHPBB3-11691