Collections: Apply rules for mod asset conflict priority. (mod level and file level)

[Al12rs]

Outline

Collections contain rules between mods and between files that determine the winners in case of file conflicts.
The app needs to interpret and apply these rules to obtain a final result that is consistent with the original collection.

Example:

Stardew Very Expanded contains the Stardew Very Configured mod containing overriders for configuration files from other mods in the collection.
SDV Very Configured needs to win conflicts with the other mods, to replace the configuration files, otherwise the output of the installed collection will not be the desired one.