* Merge method ref simplification support into LambdaCleanUpFixCore

- make the default behavior for a quick fix or Java feature convert
  to lambda cleanup to use method refs
- add new preference under Java feature page for lambda conversion to
  simplify expression and make it true by default
- have the cleanup check for either the new preference or the
  preference for simplify lambda expression and method reference
  syntax which fixes the issue that cleanups are not recursive so
  user does not have to do two cleanups in a row
- make quick fix default to use method refs
- add new tests to CleanupTests1d8
- fix cleanup ordering in jdt plugin.xml so when recursive cleanups
  are supported it will just work and duplicated code can be removed
- fixes #629