Fix most remaining SpotBugs issues, except EI and EI2

src/test/java/com/keenwrite/io/downloads/DownloadManagerTest.java

		import org.junit.jupiter.api.Test;

		+import java.io.File;
		import java.io.IOException;
		-import java.io.OutputStream;
		import java.net.URISyntaxException;
		import java.util.concurrent.ExecutionException;
		import java.util.concurrent.Executors;
		import java.util.concurrent.atomic.AtomicInteger;
		import java.util.concurrent.atomic.AtomicLong;

		import static com.keenwrite.io.downloads.DownloadManager.ProgressListener;
		import static com.keenwrite.io.downloads.DownloadManager.open;
		-import static java.io.OutputStream.nullOutputStream;
		import static java.lang.System.setProperty;
		import static org.junit.jupiter.api.Assertions.*;

		final var transferred = new AtomicLong();

		- final OutputStream output = nullOutputStream();
		final ProgressListener listener = ( percentage, bytes ) -> {
		complete.set( percentage );
		transferred.set( bytes );
		};
		+
		+ final var file = File.createTempFile("kw-", "test");
		+ file.deleteOnExit();

		final var token = open( URL );
		final var executor = Executors.newFixedThreadPool( 1 );
		- final var result = token.download( output, listener );
		+ final var result = token.download( file, listener );
		final var future = executor.submit( result );

		assertFalse( future.isDone() );
		assertTrue( complete.get() < 100 );
		- System.out.println( "tx.get: " + transferred.get() );
		assertTrue( transferred.get() > 100_000 );

src/main/java/com/keenwrite/typesetting/installer/panes/InstallerPane.java


		import java.io.File;
		-import java.io.FileOutputStream;
		import java.net.URI;
		import java.nio.file.Paths;

		final Task<Void> task = createTask( () -> {
		try( final var token = DownloadManager.open( uri ) ) {
		- final var output = new FileOutputStream( file );
		- final var downloader = token.download( output, listener );
		-
		- downloader.run();
		+ token.download( file, listener ).run();
		}

src/main/java/com/keenwrite/preferences/XmlStore.java

		import java.util.function.Consumer;

		+import static com.keenwrite.events.StatusEvent.clue;
		+import static java.nio.charset.StandardCharsets.UTF_8;
		import static javax.xml.xpath.XPathConstants.NODE;


		return node.getTextContent();
		}
		- } catch( final XPathExpressionException ignored ) {}
		+ } catch( final XPathExpressionException ignored ) { }

		throw new NoSuchElementException( key.toString() );

		assert config != null;

		- try( final var writer = new FileWriter( config ) ) {
		+ try( final var writer = new FileWriter( config, UTF_8 ) ) {
		writer.write( DocumentParser.toString( mDocument ) );
		}


		node.setTextContent( value );
		- } catch( final XPathExpressionException ignored ) {}
		+ } catch( final XPathExpressionException ex ) {
		+ clue( ex );
		+ }
		}


		node.setTextContent( item.toString() );
		}
		- } catch( final XPathExpressionException ignored ) {}
		+ } catch( final XPathExpressionException ignored ) { }
		}



		node.setTextContent( entry.getValue().toString() );
		- } catch( final XPathExpressionException ignored ) {}
		+ } catch( final XPathExpressionException ignored ) { }
		}
		}