Revert "dropped Qt project files"

This reverts commit 182b38bd4429126984aa8fd442f363f609fe88e4.
use jdns as git submodule

There is two ways to use jdns.
First as a git submodule with a qmake project. In this case
it will be static library.
Second as a standalone shared library. Such library can be
built only with cmake.
use JDNS_EXPORT macro instead of QJDNS_EXPORT

will be two libraries are C-library jdns and Qt-wrapper qjdns.
For both will be use single macro for exported functions.
export jdns functions
new sources layout