Enable command line arguments

[olo2552]

Think about command line arguments from the UX perspective.
Here are basic possible options not every functionality implemented:

1. file path
2. color
3. syntax (optional, ignores file syntax)
4. tab size of generated palette
5. search comments
6. simple (return only result, without generated palette tree)
7. warn about possible absence of color

This can turn out as possibly long-running issue. That's why for this task the best option is to think about user perspective and versatile mention it on connected issues and close is to backlog.