Remove insecure SSLv3 fallback, use TLS 1.2 if possible

STREAM_CRYPTO_METHOD_TLS_CLIENT is only TLS 1.0 except for PHP 5.6.0-5.6.6 and 7.2.0+.

Use constant type comparison for hashes

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Add parent namespace pattern replacement

Exits during testing will break the whole test suite. It makes more
sense to throw an exception in that case. The exception's stack trace
will help to debug the actual problem

No globals required anymore, somewhat more general approach to sending
data to the test system. Clean access through keys.

reformatting
fixing of doc blocks
making internal vars protected

Merge branch 'testcode-secedit' of https://github.com/LarsGit223/dokuwiki into LarsGit223-testcode-secedit

* 'testcode-secedit' of https://github.com/LarsGit223/dokuwiki:
  do not hide fatal exceptions during unit tests
  never redirect from a redirect action
  undo unecessary action routing adjustments
  Test code for workflow 'show - sectionedit - save/cancel' (with modifications in test classes and 'send_redirect()' and 'act_dispatch()'.

allow tests against ajax requests

this helps tieing together the "normal" menus and the MobileMenu and
makes them both implement a getItems() method.

SVG based page tools

* master: (72 commits)
  fix platform to the minimum requirement
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  replace conditional with array_pad
  refactor: more extensible Content-Type header handling
  fix: correctly show conflicts in extension manager
  fix: check if key is set to fix PHP Notice
  fix: access first element of associative arrays
  fix: set default value for empty var
  fix: initialize vars to prevent PHP Notice
  adjust default bcrypt iterations to 10. fixes #2093
  always send Vary: Cookie header. fixes #1594
  moved function and fixed whitespace errors
  show more info on failed HTTP requests
  do not export the appveyor config
  Added appveyor config for automated windows testing
  Update check supports HTTPS
  ...

this ensures installed composer libraries will be compatible even when
installed from a higher version platform

This doesn't really do much except wrapping the functions into a
namespaced class. Autoloading takes care of loading the file.
It's now possible to call lib/exe/ajax.php multiple times in a test
request.

* origin/pr/2054:
  cleaning
  extracted functions added test coverage
  allow tests against ajax requests

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