Loads the plugins from the classpath

By loading the plugins from the classpath, we do not have to do this
manually in the setup.

Next step is to be able to add jars and load the plugins from there.
Introcued a Xmmp and CLI variant of Magneto.

The CLI can be used for testing on localhost.
Prints simple help method

This gives the user an overview of what's possible.
Fixes to CLI and moved Politeness to its own module.
Settings now has more defaults

Also removed logback from the default classpath