[ticket/13045] Remove Pragma headers

PHPBB3-13045
[prep-release-3.1.0-RC4] Update version to 3.1.0-RC4
[prep-release-3.1.0-RC4] Add migration for 3.1.0-RC4
[prep-release-3.1.0-RC4] Prepare Changelog
[prep-release-3.1.0-RC4] Add changelog for 3.1.0-RC4
[prep-release-3.1.0-RC4] Update phpBB Version for RC4 development
Merge branch 'prep-release-3.1.0-RC4' into develop-ascraeus

* prep-release-3.1.0-RC4:
  [prep-release-3.1.0-RC4] Update phpBB Version for RC4 development
  [prep-release-3.1.0-RC4] Add changelog for 3.1.0-RC4
  [prep-release-3.1.0-RC4] Prepare Changelog
  [prep-release-3.1.0-RC4] Add migration for 3.1.0-RC4
  [prep-release-3.1.0-RC4] Update version to 3.1.0-RC4
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [prep-release-3.1.0-RC4] Update phpBB Version for RC4 development
  [prep-release-3.1.0-RC4] Add changelog for 3.1.0-RC4
  [prep-release-3.1.0-RC4] Prepare Changelog
  [prep-release-3.1.0-RC4] Add migration for 3.1.0-RC4
  [prep-release-3.1.0-RC4] Update version to 3.1.0-RC4

Conflicts:
	build/build.xml
	phpBB/includes/constants.php
	phpBB/install/schemas/schema_data.sql
	phpBB/styles/prosilver/style.cfg
	phpBB/styles/subsilver2/style.cfg
[ticket/13085] Fix typo in oauth.php

PHPBB3-13085
Merge pull request #2976 from n-aleha/ticket/13085

[ticket/13085] Fix typo in oauth.php
Merge branch 'develop-ascraeus' into develop

# By n-aleha
# Via Dhruv Goel (1) and n-aleha (1)
* develop-ascraeus:
  [ticket/13085] Fix typo in oauth.php
Merge pull request #2963 from Senky/ticket/13045

[ticket/13045] Remove Pragma headers
Merge branch 'develop-ascraeus' into develop

# By Jakub Senko
# Via Dhruv Goel (1) and Jakub Senko (1)
* develop-ascraeus:
  [ticket/13045] Remove Pragma headers