Make exceptions suitable for direct usage in end user applications

[JohnnyJayJay]

Is your feature request related to a problem? Please describe.
Exceptions in mela-command are fairly rudimentary right now and not much more than just subclasses of RuntimeException with little to no additional properties. Furthermore, some of the default exception messages reference code and can't really be used to help end users.

Describe the solution you'd like
Exceptions should contain additional information of all kinds, including, but not limited to

• detailed exception messages made to be understood by end users without reference to the code
• possible fixes/suggestions as a String
• more details for exceptions related to arguments (as requested in Provide more information in exceptions #2 )
• methods to format exceptions in a readable way
• eventual support for localisation

Describe alternatives you've considered
The alternative to this would be to go in the opposite direction and discourage the use of exceptions to indicate issues to end users. This would require more boilerplate and would probably go against this project's principles, though.

Additional context
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