Remove wrapper around obsolete kiwix::Reader and kiwix::Searcher.

Author: mgautierfr

lib/src/main/java/org/kiwix/libkiwix/Book.java

@@ -1,13 +1,15 @@
 
 package org.kiwix.libkiwix;
 
+import org.kiwix.libzim.Archive;
+
 public class Book
 {
   public Book() { allocate(); }
 
 
   public native void update(Book book);
-  public native void update(JNIKiwixReader reader);
+  public native void update(Archive archive);
 
   @Override
   protected void finalize() { dispose();  }