Log observer console application

[aregtech]

Description:

In the logging, the applications are set to have following categories: client, service, observer, test, simulation.
The observer is an application like log viewer.
There should be implemented a simple console log observer application to make:

1. receive the list of log sources;
2. receive the list of log scopes and priorities;
3. control the logs in command line to make:
   • save the logs in the logging file as a plain text;
   • save the logs in a database;
   • activate and deactivate, change log priorities of the scopes;
   • start, stop and pause logging;
   • save current log state in a configuration file.

Note: due to large list of features, this ticket should be split in multiple issues with the label log observer.

[aregtech]

implemented. need more tests.