[FEATURE] Error code naming scheme

[LukeS-05]

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Is your feature request related to a problem? Please describe.
The error code scheme is inconsistent and doesn't make sense, given that the prefix 2 was inherited from the old project and has been used for all error codes.

Describe the solution you'd like
A more logical error code scheme, with digit 1 representing the module (e.g. passgen, phrasegen), digit 2 representing the type of error (e.g. data type validation, file error) and digit 3 being an identifier for the specific error.

For example, rather than [206] for "Password length must be given as an integer.", use a code like [101]

• 1 - passgen
• 0 - data type validation
• 1 - error 1

Describe alternatives you've considered
While the current numbering scheme is okay, the 2 prefix holds no value and is simply used for all error codes.