Guess Packages for Config Options

[eriq-augustine]

For certain config options where we are trying to load a class.
Say choosing the term story for inference.
Or perhaps the CLI choosing what inference or weight learning to use (even though this is not a config issue).

It would be great if someone could specify just the class name instead.
So LazyMPEInference instead of org.linqs.psl.application.inference.LazyMPEInference.

The classloader may not have loaded all the classes yet, so we probably can't rely on that.
Maybe we can have maven put all the classnames in a properties file.
Or have some expected prefixes that we assume if we cannot find the specified class name.

[eriq-augustine]

Of the proposed options:

1. The first one will require a new maven plugin (I found none that had this functionality by default).
2. The second one would require all relevant config calls to declare an expected package.

Of these, 1 is more maintainable.
We will go with that.

[eriq-augustine]

Plugin implemented and in Maven Central:
https://search.maven.org/search?q=a:list-classes-maven-plugin

[eriq-augustine]

Complete in 00b6032.