hierarchical storage of settings should be implemented

At this moment, all our settings is storing the data in key-value pair for a specific project location. However, if we see that we can support multiple projects, them some of the items in the settings can be independent of every project. 

For example: Ngrok token, Qt account token etc.

So, we should implement the hierarchical storage of settings. Something like: 

settings-file.config 

[global]
ngrok_token = value
qt_token = value
[project_specific]
gitlab_url = value
gitlab_token = value
project_id = value
project_path = value
project_api_url = value  

and so forth...