Order asmdef references alphabetically

With the new feature of adding references to .asmdef files, it would be great if they were kept in alphabetical order. This reduces the chances of getting version control conflicts when working in a team. It also groups related references nicely together.

If reordering existing references (as you can't really do alphabetical otherwise) feels like too intrusive for existing projects, perhaps it could be made an opt-in setting?

The issue does not name a file, test, or entry point. Trace the code that adds references to .asmdef files, then resolve whether existing references should be reordered by default or behind an opt-in setting. Done means references are alphabetized and the chosen behavior for existing projects is covered.

Written by the indexing model from the issue text.