Features:

• Show codes for all diagnostics and allow them to be ignored @dantleech
  #2781

Improvements:

• Do not highlight entire class for fix class/namespace name diagnostic
  #2728 @dantleech
• Tolerate code action provider failures #2761 @dantleech
• Limit number of methods that are documented on classes to improve
  completion/resolve performance for large classes #2768 @dantleech

Bug fixes:

• Navigator: Fix attempt to create existing directories #2776 @bart-jaskulski
• Fix goto constant within a trait #2784 @dantleech
• Preserve PHAR scheme when indexing PHAR stubs @dantleech #2754
• Fix duplicated types when updating methods @mamazu #2779