Updated Grid API (#3399)

* Updated Grid API

Added Nonull/Nullable/Nonnegative where applicable.
Deprecated unused methods
Changed concrete classes with interfaces (HashMap -> Map)
IGridTickable will no longer accept null as TickingRequest. Do not
implement it, if it should not tick.

* Renamed parameter to match conventions

src/api/java/appeng/api/networking/IGridMultiblock.java

@@ -26,6 +26,8 @@ package appeng.api.networking;
 
 import java.util.Iterator;
 
+import javax.annotation.Nonnull;
+
 
 /**
  * An extension of IGridBlock, only means something when your getFlags() contains REQUIRE_CHANNEL, when done properly it
@@ -40,5 +42,6 @@ public interface IGridMultiblock extends IGridBlock
 	 *
 	 * @return an iterator that will iterate all the nodes for the multiblock. ( read-only iterator expected. )
 	 */
+	@Nonnull
 	Iterator<IGridNode> getMultiblockNodes();
 }