Debug mode to logging

[michilyy]

What kind of change does this PR introduce? (check at least one)

• [x] Bugfix
• [ ] Feature
• [ ] Code style update
• [ ] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

The PR fulfills these requirements:

• [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• [ ] A convincing reason for adding this feature (it's best to open a suggestion issue first and wait for approval before working on it)

Other information: Add debug mode to logging.

If swingmusic is launched in debug mode (--debug) stack traces are print directly on terminal. On all other instances stack traces are not printed on terminal