Import Picking and placing single houses in scenario editor patch

Minor whitespace fixes

http://www.tt-forums.net/viewtopic.php?f=33&t=68894&view=unread#p1099696

src/window_type.h

@@ -236,6 +236,12 @@ enum WindowClass {
 	 */
 	WC_SELECT_STATION,
 
+	/**
+	 * Select town (when placing a house); %Window numbers:
+	 *   - 0 = #SelectTownWidgets
+	 */
+	WC_SELECT_TOWN,
+
 	/**
 	 * News window; %Window numbers:
 	 *   - 0 = #NewsWidgets
@@ -370,6 +376,12 @@ enum WindowClass {
 	 */
 	WC_BUILD_OBJECT,
 
+	/**
+	 * Build house; %Window numbers:
+	 *  - 0 = #BuildHouseWidgets
+	*/
+	WC_BUILD_HOUSE,
+
 	/**
 	 * Build vehicle; %Window numbers:
 	 *   - #VehicleType = #BuildVehicleWidgets