[Development] Moving qthttpserver from qt-extensions to qt5

[Ievgenii Meshcheriakov]

Hi,

I'd like to move the QtHttpServer module from it current place in qt-
extensions [1] to the qt5 hierarchy as a preview module. This would make it 
easier for users to use the module, especially with other Qt versions than 
"dev". The plan is to make QtHttpServer a normal qt module once it's ready, 
see also [2], [3].

QtHttpServer provides a lightweight server implementing the HTTP protocol.

Regards,
Ievgenii

1. https://codereview.qt-project.org/gitweb?p=qt-extensions/
qthttpserver.git;a=summary
2. https://bugreports.qt.io/browse/QTBUG-100994
3. https://bugreports.qt.io/browse/QTBUG-60105