[ntcore] Various fixes and cleanups (#4544)

* NetworkTableInstance: set handle to 0 after destroy
* Fix multiple notifications of local values
* Detect mismatch between handles
* Server: fix setting min period when no topics
* Limit maximum number of subscribers/publishers/listeners
   This helps find resource leaks and prevents them from causing excessive
   slowdowns/crashes.  The limit on each is currently set to 512.
* Don't use std::swap in move operation

ntcore/src/generate/java/NetworkTableInstance.java.jinja

@@ -68,6 +68,7 @@ public final class NetworkTableInstance implements AutoCloseable {
     if (m_owned && m_handle != 0) {
       m_listeners.close();
       NetworkTablesJNI.destroyInstance(m_handle);
+      m_handle = 0;
     }
   }
 
@@ -986,5 +987,5 @@ public final class NetworkTableInstance implements AutoCloseable {
   }
 
   private boolean m_owned;
-  private final int m_handle;
+  private int m_handle;
 }