Changes cursor position to end of inserted image syntax, implements #2079 

Refactored section edit

Translation update (pt-br)

Remove createMock* polyfill for PHPUnit to let PHP 7.2 tests run

Translation update (ko)

try to display an error when installer is run without php

Translation update (uk)

The data for the section edit button is now passed as an assoziative array which is
encoded in the '#<!-- EDIT(.*) -->#' placeholder as an JSON array.

Translation update (sk)

When a server has no PHP support enabled, it will either prompt to
download a PHP file or may display it as HTML instead. When a user tries
to run install.php with a server that does the latter, they will see
some weird garbage with the browser trying to interpret raw PHP as HTML.
This pathc adds a warning at the top, telling the user what is going on.

Translation update (sl)

Translation update (sl)

move class DokuHTTPClient behind HTTPClient

2 different people reported errors that seems to be solved when following the "If a class extends another, then the parent class must be declared before the child class structure." of http://php.net/manual/en/language.oop5.inheritance.php
Couldn't exactly reproduce under which php/environment the problem occurs, but following the MUST of the PHP documentation seems not to be wrong..

https://github.com/Flyspray/flyspray/pull/647

Translation update (zh)

remove deprecated method call from html_login

feat: add optionally an SVG to html_btn

Translation update (eo)

To prevent abusing this functionality for inserting arbitrary html,
inlineSVG is now called inside the html_btn function.

Translation update (hr)

Updated README: Upped year to 2018

Translation update (he)

Translation update (he)