Add AES from phpseclib and use it for cookie encryption

This replaces the deprecated and broken Blowfish implementation that has
previously been used and should provide a lot more security.

Add truly random numbers and use them in places where randomness matters

unit tests for self deleting of user accounts

Fix the useheading cache invalidation for hidden pages, add tests

This adds a new parameter to ft_backlinks() to ignore permissions which
is needed for invalidating the cache of linking pages with u

Fix the useheading cache invalidation for hidden pages, add tests

This adds a new parameter to ft_backlinks() to ignore permissions which
is needed for invalidating the cache of linking pages with useheading
enabled. This also adds various test cases for ft_backlinks().

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Simple test cases for code and file token fix

added test case for FS#1442

Fixed file names of test classes

Added tests for getRevisions and getRevisionInfo from page changelog

update hashes in tests

update common_ml test for hash change

added HMAC support to PassHash class FS#2794

tests for media_isexternal

fix some minor typos in fetch_imagetoken.test.php

tests for fetch.php of external files

Add some tests about handling of semicolons
Informative as sample implementation too

Clean internal ids in ml(), that it matches with fetch.php
The resize token was broken because fetch.php cleans the id before the token calculation, while ml() uses the raw id

added missing test case files

tar library: another fix for lone zero blocks

fixed test name

add some tests for ml()

stream select parameters need to be reset for each call

add some dependency checks with test skips to fetch tests and tests which use TestResponse::headers

add test for fetch using image tokens

update TestResponse class to return specific headers & status codes (with tests)

extend TestRequest class to test fetch & detail; add a test to check it does