Better method for determining compatible types

[trharoldsen]

Currently, the only way to get compatible site types of another site type is to access the device, query for the site template (which I've tried to keep from being a common occurrence), and then check the compatible types. This is cumbersome and especially problematic if you don't have a pointer to the device. We should provide some better method of getting possible site types.

Three proposed methods are

1. Add a method to the device class to get compatible types of a type. This would internally query the site template and check.
   2a. Add it to the family info class. If desired, this could be programmatically entered similar to how the site types are generated for the class.
   2b. In addition to adding it to the family info, add a method to the site type class that will check the family info class for compatible types.