v0.5.4 released! Keyword is data-protection. Many small bugfixes, but

main changes are:
- Modified marker (* character before name) goes up the project tree by
marking all parents of a modified object as modified.
- Impact management when changing an object's ID. Allows for some
refactoring to occur, while marking the impacted elements as modified,
or aven creating "altered" versions if imapcted element was only in game
source.

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

@@ -95,14 +95,14 @@ public class WorkspaceActions {
 		public void actionPerformed(ActionEvent e) {
 			if (!(selectedNode instanceof GameDataElement)) return;
 			final GameDataElement node = ((GameDataElement)selectedNode); 
-			if (node.state == GameDataElement.State.modified){
+			if (node.needsSaving()){
 				node.save();
 				ATContentStudio.frame.nodeChanged(node);
 			}
 		};
 		public void selectionChanged(ProjectTreeNode selectedNode, TreePath[] selectedPaths) {
 			if (selectedNode instanceof GameDataElement) {
-				setEnabled(((GameDataElement)selectedNode).state == GameDataElement.State.modified);
+				setEnabled(((GameDataElement)selectedNode).needsSaving());
 			} else {
 				setEnabled(false);
 			}
@@ -330,8 +330,14 @@ public class WorkspaceActions {
 	
 	public ATCSAction exitATCS = new ATCSAction("Exit", "Closes the program"){
 		public void actionPerformed(ActionEvent e) {
-			//TODO ouch.
-			System.exit(0);
+			if (Workspace.activeWorkspace.needsSaving()) {
+				int answer = JOptionPane.showConfirmDialog(ATContentStudio.frame, "There are unsaved changes in your workspace.\nExiting ATCS will discard these changes.\nDo you really want to exit?", "Unsaved changes. Confirm exit.", JOptionPane.YES_NO_OPTION);
+				if (answer == JOptionPane.YES_OPTION) {
+					System.exit(0);
+				}
+			} else {
+				System.exit(0);
+			}
 		};
 	};