Add snort source files (snort-project/snort-source/) and cmake generated Eclipse CDT project (snort-project/)

Add Eclipse project commands and explanation how to build initial project from source, update  startup script to mount (Eclipse) workspace and snort project (cmake generated) into developer home directory

Update Dockerfile: link with Docker Hub (automated build), download auto and cmake snort, and snort-extra files into separate folders

Update Dockerfile: add snort dependencies libsafec, Ragel, Boost, Hyperscan, DAQ (2.2.1) based on https://sublimerobots.com/2017/07/installing-snort-3-b237-in-ubuntu

Update Dockerfile: add snort dependencies openssl, LuaJIT, hwloc, libdnet, netmap (comment) and DAQ, Snort++