• Enabled remap-reflect-field flag
• Fixed access transformer enabling reflection remapping
  • The AT remapper is a postprocessor running after the main remap is done. As a result, the class names used to look up reflection are the remapped class names, not the original, resulting in at best no matches and at worst incorrect matches.
• Fixed not being able to remap reflective access of fields from Proguard mappings
  • Converted JarMapping.fields to a SortedMap to make searching mappings to ignore description less intensive

This appears to work well, but my use case is a single field (which is also why I was so slow to bother submitting a PR) so I have not done particularly extensive testing. I don't know if using a SortedMap is actually necessary for performance, but I figured searching all 29k fields from vanilla for every single call in reflection-heavy projects would be a Bad Idea™.

Closes #87