Drop automatic message prefix from command errors

[jotaen]

Resolves #383.

With this PR, kong will pass through error messages from commands’ Run() methods as is, without wrapping them up or reformatting them.

The callMethod is obsolete now, its only purpose was the error wrapping. The callers can use callFunction directly.

[alecthomas]

Ah I remember what the intent of this was now - it was to put the command name in the error message. So eg. if you had foo cmd the error would be prefixed with cmd: ....

[jotaen]

Do you plan on cutting a release anytime soon? 😊

[jotaen]

Ah I remember what the intent of this was now - it was to put the command name in the error message. So eg. if you had foo cmd the error would be prefixed with cmd: ....

Ah okay! I think I’d personally still prefer for the error message to be unmodified, though, as that would give more control to the application in regards to how to error messages are displayed.