- modify ControlStatementsFix.AddBlockOperation.rewriteAST() to
  support FORMATTER_BRACE_POSITION_FOR_BLOCK preferences that
  are not same line
- add support for Mac/Windows line separators and remove unnecessary
  newline references

Change-Id: I64e5a0a9fdd279017639018a409f572f3fd77629
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.ui/+/189908
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Tested-by: Jeff Johnston <jjohnstn@redhat.com>
Reviewed-by: Jeff Johnston <jjohnstn@redhat.com>