This reverts commit 6a1a4880.

**Changes:**

* In line 103, the middle "c" of "owncloud" is capitalised to "ownCloud".
* A space is inserted between value and unit in lines 177 and 187 ("4 GB" instead of "4GB").

This function is often used in a wrong and potential dangerous way... Thus we should escape the URL per default and offer developers to disable the automatic escaping via an option parameter if they really want that behaviour.

Might break some things, however, those things are then easy to fix and we really have a ton of bugs caused by this...

Fixes https://github.com/owncloud/core/issues/14228

This is not relevant anymore since we require PHP 5.4

One cannot make any assumptions about the requesttoken content. Thus we need to encode it.

Changed *"won't work"* to "will not work" (as proposed by @DeepDiver1975).

*Changes:*

* "… is not yet properly setup" in line 24 is changed to " … is not yet set up properly" (better word order and space in the middle of "set up", as it is a participle of the verb "to set up").
* "internet" is corrected to "Internet" with a capitalized "I" in lines 54 and 59.
* Also in line 54: "3rd party" is changed to "third-party" to for a more coherent spelling across the different ownCloud components.
* "… apps don´t work" is corrected to "… apps won't work" (with a proper (and hopefully correctly escaped) (apostrophe)[http://en.wikipedia.org/wiki/Apostrophe#Typographic_form] instead of the (acute accent)[http://en.wikipedia.org/wiki/Acute_accent]).
* Still in line 54: The negation is corrected from "… might also not work" to "… might not work, either".

This enforces proper types on POST and GET arguments where I considered it sensible. I didn't update some as I don't know what kind of values they would support 🙈

Fixes https://github.com/owncloud/core/issues/14196 for core

Still not correct but it is a small step