Improve error messages

[Pingblue]

I noticed this error appears when the port for the GUI is blocked.

[13.03.2018 18:20:09] Error downloading files. Make sure autodl-irssi is started and configured properly (eg. password, port number): Error getting files listing: Error: Invalid password

I changed the password many times before noticing the issue was with the port and not the password.

Could the error message not be changed for example "Error: Port blocked or Invalid password"

[thebigmunch]

I'll keep in mind improving some error messages. But, the error messages are a kind of conglomeration of a chaotic (slight exaggeration) web of pieces. It'll take some diving to really improve them.