#3 Use class-based exceptions

[Andrew Reutter]

Use class-based exceptions instead of the string
constants currently in use.

Define a decent hierarchy, don't do it haphazard like.
Perhaps:

EwgLibException(Exception)
NetworkingException(EwgLibException)
BrowsingException(NetworkingException)
SimpleSocketException(NetworkingException)
...
AppFrameworkException(EwgLibException)
...