Static build of the client for Linux

By popular demand, we have made a static build of the client for Linux. The tests were conducted on the following systems: Debian 8, Debian 9, Ubuntu 15.04, Ubuntu 16.04, Ubuntu 17.04, Ubuntu 18.04, Linux Mint 18, Linux Mint 19. We have also updated the client build for MacOS and carried out tests on MacOS operating systems below 10.8.