[ntcore] Add subscriber option to exclude single publisher

This enables limited self-exclusion for entries seeing their own changes
or similarly with a pub/sub pair.

ntcore/src/main/native/include/ntcore_c.h

@@ -96,6 +96,8 @@ enum NT_PubSubOptionType {
   NT_PUBSUB_POLLSTORAGE,    /* polling storage for subscription */
   NT_PUBSUB_KEEPDUPLICATES, /* preserve duplicate values */
   NT_PUBSUB_LOCALREMOTE,    /* local, remote, or any value changes */
+  NT_PUBSUB_EXCLUDEPUB,     /* exclude value changes made by given publisher */
+  NT_PUBSUB_EXCLUDESELF,    /* exclude value changes made by entry publisher */
 };
 
 /** Event notification flags. */
@@ -290,7 +292,7 @@ struct NT_PubSubOption {
    * Option value.  1 (true) or 0 (false) for immediate and logging options,
    * time between updates, in milliseconds, for periodic option.  For
    * local/remote option, 1=local only, 2=remote only, 0 or 3=both local and
-   * remote.
+   * remote.  For exclude publisher, publisher handle.
    */
   unsigned int value;
 };

ntcore/src/main/native/include/ntcore_cpp.h

@@ -358,6 +358,28 @@ class PubSubOption {
     return PubSubOption{NT_PUBSUB_LOCALREMOTE, 0u};
   }
 
+  /**
+   * Don't queue value updates for the given publisher. Only has an effect on
+   * subscriptions. Only one exclusion may be set.
+   *
+   * @param publisher publisher handle
+   * @return option
+   */
+  static constexpr PubSubOption ExcludePublisher(NT_Publisher publisher) {
+    return PubSubOption{NT_PUBSUB_EXCLUDEPUB, publisher};
+  }
+
+  /**
+   * Don't queue value updates for the internal publisher for an entry. Only has
+   * an effect on entries.
+   *
+   * @param enabled True to enable, false to disable
+   * @return option
+   */
+  static constexpr PubSubOption ExcludeSelf(bool enabled) {
+    return PubSubOption{NT_PUBSUB_EXCLUDESELF, enabled ? 1u : 0u};
+  }
+
   NT_PubSubOptionType type;
   unsigned int value;
 };