A collection of standard errors / exceptions / etc
- Most exceptions should be considered problems, exiting the process with non-zero exit code by default (eg HeaderChecksumFailed)
- Some should exit with 0 (eg UnitTestPassed, or Quit for a user-initiated controlled exit)
- There should be variables in the error messages, eg "Invalid cart type: MBC3" rather than just "Invalid cart type"
The error objects themselves should contain the string for the error message,
and the exit code -- I don't want the main() method (where we catch the errors)
to be deciding how to render each one of them individually.
Ideally there would be some sort of inheritance going on, so that the main()
method can catch EmuError and all of its sub-errors and not need to handle
eg HeaderChecksumFailed and LogoChecksumFailed as two different types.