Logger does not use the defined directory

[FlorianK13]

The logger always writes to the standard directory HOME/.open-mastr/... - even if an own path is defined as OUTPUT_PATH.
To solve this, I think we should get rid of this get_project_home_dir function that always returns the hardcoded HOME/.open-mastr/... and use the get_output_dir function everywhere in the codebase.

[FlorianK13]

I changed my opinion - we should instead get rid of the get_output_dir function. The get_project_home_dir is a better name for what this function is actually doing.