Protocol flow refactor

• Add SDC class, add env variables defaults, move from applications to documents, add messages management.
• Add source update functionality
• Add documents and projects templates functionality
• Add possibility to define Redis's keys expiration time
• Add possibility to enable document transmission
• Add possibility to enable document sending

closes #1 (closed), #2 (closed), #3 (closed), #4 (closed), #5 (closed), #9 (closed), #12