* Parallelized qt build and install (with make -j)

* Parallelized compression for rpm package (with pigz)
* Fixed dependencies in docker files
* Fixed qt configure in RPM spec file (added font support with fontconfig, accessibility options, text-to-speech...)
* Little sed + xargs hack to workaround some distros refusing to build with python2 shebangs
* Change Qt git repo for building docker image to https in order to pass firewall and avoid timeout while cloning