Remove `AprsIsConstants` class

[CBielstein]

Description

Since the AprsIsConstants values are now only used in one place (the AprsSharp CLI command line flags setup), we should do away with the class of constants and just code them directly in to the CLI setup. This consolidates the logic to where it is actually used and avoids bloating code.

Acceptance Criteria

• Delete AprsIsConstants class
• Move hard coded constants directly to the AprsSharp Program.cs configuration of the command line parameters