Changed the default uiWindowOnClosing() behavior. Decided to keep the int return.

TODO.md

@@ -1,5 +1,3 @@
-- should uiWindowOnClosing() really return an int?
-	- if so, should the default return 0 instead of 1?
 - note that uiInitOptions should be initialized to zero
 	- have a cbSize member
 - drop "Page" from uiTab method names? (uiTabAppendPage() -> uiTabAppend())
@@ -61,3 +59,4 @@ notes to self
 	- reconsider this, as the pointer array code does work with the first invalid index...
 		- we would need to test everything else with it
 - note that uiTabInsertPageBefore() does NOT change the current tab page (it may change its index if inserting before the current page)
+- note that the default action for uiWindowOnClosing() is to return 0 (keep the window open)

darwin/window.m

@@ -49,7 +49,7 @@ struct window {
 
 static int defaultOnClosing(uiWindow *w, void *data)
 {
-	return 1;
+	return 0;
 }
 
 static void windowDestroy(uiControl *c)

unix/window.c

@@ -36,7 +36,7 @@ static gboolean onClosing(GtkWidget *win, GdkEvent *e, gpointer data)
 
 static int defaultOnClosing(uiWindow *w, void *data)
 {
-	return 1;
+	return 0;
 }
 
 static void windowDestroy(uiControl *c)

windows/window.c

@@ -73,7 +73,7 @@ ATOM registerWindowClass(HICON hDefaultIcon, HCURSOR hDefaultCursor)
 
 static int defaultOnClosing(uiWindow *w, void *data)
 {
-	return 1;
+	return 0;
 }
 
 static void windowDestroy(uiControl *c)