ui: project wizzard design

* switched to QGridLayout for wizzard content layouting
* distinguish scrollable windows based on content
* content can define window size
* removed QtApplicationSettingsScreen, now done via QtProjectWizzardWindow and QtProjectWizzardContentPreferences
* added new project icon

bin/app/data/gui/setting_window/listbox.css

@@ -24,27 +24,14 @@ QtListItemWidget #field {
 	border: none;
 	font-size: 12px;
 	margin-top: 2px;
-}
-
-QtListItemWidget #button {
-	border: 1px solid lightgray;
-	border-radius: 7px;
-	font-size: 12px;
-	height: 14px;
-	margin-right: 2px;
-	width: 20px;
-}
-
-QtListItemWidget #button:hover {
-	color: white;
-	background: #2D3F85;
+	margin-left: 5px;
 }
 
 #bar {
 	border-top: 1px solid lightgray;
 }
 
-#roundedButton {
+#plusButton, #minusButton, #dotsButton {
 	color: white;
 	height: 16px;
 	margin-right: 3px;
@@ -52,6 +39,34 @@ QtListItemWidget #button:hover {
 	border: none;
 }
 
+#dotsButton {
+	margin-top: 2px;
+}
+
+#plusButton {
+	border-image: url(<setting:gui_path>setting_window/plus.png);
+}
+
+#plusButton:hover {
+	border-image: url(<setting:gui_path>setting_window/plus_hover.png);
+}
+
+#minusButton {
+	border-image: url(<setting:gui_path>setting_window/minus.png);
+}
+
+#minusButton:hover {
+	border-image: url(<setting:gui_path>setting_window/minus_hover.png);
+}
+
+#dotsButton {
+	border-image: url(<setting:gui_path>setting_window/dots.png);
+}
+
+#dotsButton:hover {
+	border-image: url(<setting:gui_path>setting_window/dots_hover.png);
+}
+
 #dropInfo {
 	color: lightgray;
 }