[hxb] --hxb-lib vs. -cp vs. --java-lib

At the moment the compiler looks for types in a specific order:

1. Check --hxb-lib
2. Check -cp (and by extension -lib)
3. Check --java-lib and such

I would like to change it so that the priority reflects the order of the CLI arguments for all three of these. This was also the main motivation for #11477, but is going to require even more refactoring.