Support for rule system component aliasing

[QMalcolm]

Is your feature request related to a problem? Please describe.
Not all rule systems use the same terminology. What is called abilities in one system might be attributes or stats in another. This applies to most rule system components. Thus to make rule systems seem "natural" we should support aliasing.

Describe the solution you'd like
We should add support for a base aliases key which is a map of component names (abilities, skills, etc) to what they are called in that system (attributes, proficiencies, etc).

Describe alternatives you've considered
Not doing this