Conditional Data API #344
Description
A major flaw with data files is that if you want to add mod compatibility/integration in the form of data files (i.e. adding a recipe for another mod's workstation) is that you need to use mixins to prevent those data files from loading when the other mod is not present, otherwise, the console and logs are spammed with exceptions. Since this deals with inter-mod compatibility, I feel it would be a good fit for QSL to implement.
This API would consist of a simple event that would be fired every time MC finds a data file to load. Listeners would return a boolean to determine whether or not that file should be skipped. Since the most common use case would be checking whether a given mod is present, a helper function would also be available for creating a listener that checks if a given mod is loaded.
In the past, LibCD was used to accomplish this through a separate .mcmeta file for each data file you wanted to have conditionally loaded. In my experience, this approach was far from ergonomic.