Allow to use custom filename && directory name to store configs

[feruzoripov]

Problem

The current solution of hardcoding the filename and directory name to settings.yml and settings folder is not ideal, as it can lead to conflicts if the same filename or directory name is already being used by other logics.

A better solution is to add two configuration fields, Config.file_name and Config.dir_name, which will allow users to specify their own filename and directory name. This will make it possible to avoid conflicts and it will also give users more flexibility in how they store their data.

Solution

Added two configuration fields:

• Config.file_name for filename
• Config.dir_name for directory name

[feruzoripov]

PR: #341

[pkuczynski]

Sounds reasonable. @cjlarose what do you think?