Fixed memory leaks.

Closed projects were held in memory because the Map folder watcher
threads were still alive.

src/com/gpl/rpg/atcontentstudio/model/maps/TMXMapSet.java

@@ -15,6 +15,7 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.Enumeration;
 import java.util.List;
+import java.util.concurrent.TimeUnit;
 
 import javax.swing.tree.TreeNode;
 
@@ -102,19 +103,21 @@ public class TMXMapSet implements ProjectTreeNode {
 							/*WatchKey watchKey = */folderPath.register(watchService, StandardWatchEventKinds.ENTRY_MODIFY);
 							WatchKey wk;
 							validService: while(getProject().open) {
-								wk = watchService.take();
-								for (WatchEvent<?> event : wk.pollEvents()) {
-									Path changed = (Path) event.context();
-									String name = changed.getFileName().toString();
-									String id = name.substring(0, name.length() - 4);
-									TMXMap map = getMap(id);
-									if (map != null) {
-										map.mapChangedOnDisk();
+								wk = watchService.poll(10, TimeUnit.SECONDS);
+								if (wk != null) {
+									for (WatchEvent<?> event : wk.pollEvents()) {
+										Path changed = (Path) event.context();
+										String name = changed.getFileName().toString();
+										String id = name.substring(0, name.length() - 4);
+										TMXMap map = getMap(id);
+										if (map != null) {
+											map.mapChangedOnDisk();
+										}
+									}
+									if(!wk.reset()) {
+										watchService.close();
+										break validService;
 									}
-								}
-								if(!wk.reset()) {
-									watchService.close();
-									break validService;
 								}
 							}
 						} catch (IOException e) {

src/com/gpl/rpg/atcontentstudio/ui/WorkspaceActions.java

@@ -59,6 +59,7 @@ public class WorkspaceActions {
 		public void actionPerformed(ActionEvent e) {
 			if (!(selectedNode instanceof Project)) return;
 			Workspace.closeProject((Project) selectedNode);
+			selectedNode = null;
 		};
 		public void selectionChanged(ProjectTreeNode selectedNode, TreePath[] selectedPaths) {
 			setEnabled(selectedNode instanceof Project);