[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
[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/11870] No longer exclude search/fulltext_*.php from code coverage.

PHPBB3-11870
[ticket/11871] Allow backslash in classnames for Modules

PHPBB3-11871
Merge branch 'develop' of github.com:phpbb/phpbb3 into ticket/11850

# By Nils Adermann (68) and others
# Via Andreas Fischer (12) and others
* 'develop' of github.com:phpbb/phpbb3: (102 commits)
  [ticket/11876] Replace MD5 with SHA256.
  [ticket/11876] Move checksum generation from build PHP files to phing build.xml
  [develop-olympus] Build against 3.0.12 instead of 3.0.12-RC3. Tag exists now.
  [prep-release-3.0.12] Update changelog for 3.0.12 release.
  [ticket/11873] Add unit test for large password input.
  [ticket/11873] Do not hash very large passwords in order to safe resources.
  [ticket/11862] Correct var names in user_delete() events due to prune-users
  [develop-olympus] Use 3.0.13-dev as build version. Use latest 3.0.12 RC tag.
  [prep-release-3.0.12] Bumping version number for 3.0.12 final.
  [ticket/11852] Add class file
  [ticket/11852] Move tests to folder with new class name
  [ticket/11852] Split filesystem and path_helper into 2 classes
  [ticket/11868] Add @depends to test
  [ticket/11868] Add functional test for registration
  [ticket/11868] Replace phpbb_request_interface references
  [ticket/11866] Only single backslash in .md files
  [ticket/11866] Remove outdated and broken develop script
  [ticket/11866] More namespaces
  [ticket/11866] Update some occurances of phpbb_db_ to new Namespace
  [ticket/11865] Convert old class name to namespaced version
  ...

Conflicts:
	tests/security/extract_current_page_test.php
	tests/session/testable_facade.php
[ticket/11850] Update for namespaces

PHPBB3-11850