Commits on Sep 24, 2017

1. support external annotations …

   This commit adds initial support for external annotations.
   
   There is a new project "eclipse-external-annotations" that must be
   imported in the Eclipse IDE.
   
   If added already some annotations:
   * JRE
      * Object.toString() returns a `@NonNull` String
      * Collections.empty... returns a `@NonNull` reference
      * Collections.singleton... returns a `@NonNull` reference
      * Collections.synchronized... returns a `@NonNull` reference
      * Collections.unmodifiable... returns a `@NonNull` reference
      * ... added a lot more ones while working and rebasing that branch.
   * slf4j
      * LoggerFactory.getLogger(...) returns a `@NonNull` reference
   
   If a project should use external annotations this needs to be configured
   for the Eclipse IDE in the project settings of each project.
   See [Configuring a project to use external annotations]
   Open the project settings and navigate to "Java Build Path", "Library"
   tab. Set the external annotation reference for "JRE System Library" and
   "Plug-in Dependencies".
   This has been already applied for the core and the core.things project.
   
   For the headless consumption a "dedicated path" is possible
   ("-annotationpath location").
   See [Headless consumption]
   This setting has been already added to the POM file.
   
   Add new annotations is very easy as it is supported by the IDE.
   See [Creating external annotations]
   
   [Configuring a project to use external annotations]: http://help.eclipse.org/oxygen/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Ftasks%2Ftask-using_external_null_annotations.htm&cp=1_3_9_2&anchor=configure
   [Creating external annotations]: http://help.eclipse.org/oxygen/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Ftasks%2Ftask-using_external_null_annotations.htm&cp=1_3_9_2&anchor=create
   [Headless consumption]: https://wiki.eclipse.org/JDT_Core/Null_Analysis/External_Annotations#Headless_consumption
   
   Signed-off-by: Markus Rathgeb <maggu2810@gmail.com>

   

   maggu2810 committed Sep 24, 2017
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2. fix nullness annotations for ItemRegistryDelegate …

   Signed-off-by: Markus Rathgeb <maggu2810@gmail.com>

   

   maggu2810 committed Sep 24, 2017
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