Create a GlobalCliParameters class to handle global parameter parsing seperately

[PladsElsker]

The static methods would be something like:

• getSaveInNewFileParam(args)
• getTimeIntervalParam(args)
• getSaveAsNewBeatmapParam(args)

They would all return an optional of a list of parameters (Optional<List<String>>). The optional would be empty if the searched parameter is absent.

Furthermore, we can create constants for the name of the expected global parameters.

[PladsElsker]

didn't do it exactly like that because I think I found a better idea for it