Create checker for interactives that should be activated for a language

[JackMorganNZ]

This will assist in spotting interactives that should enabled for a chapter. This could be done easily using a database query when the system is running, or a manual script reading the raw data in files.

[JackMorganNZ]

This is harder to implement than first thought, due to the fact that interactives have a relationship to a chapter, and not a chapter section. Therefore we can only check if interactives are available for the whole chapter.

We would need to implement chapter section relationships in addition, or track these during loading to check if they are available.

This will take a while to plan and implement, and since it can be currently performed manually, we will push this to a later date.