Add hotkey for picker tool in scenario editor

src/toolbar_gui.cpp

@@ -2528,6 +2528,7 @@ enum MainToolbarEditorHotkeys {
 	MTEHK_SIGN,
 	MTEHK_MUSIC,
 	MTEHK_LANDINFO,
+	MTEHK_PICKER,
 	MTEHK_SMALL_SCREENSHOT,
 	MTEHK_ZOOMEDIN_SCREENSHOT,
 	MTEHK_DEFAULTZOOM_SCREENSHOT,
@@ -2646,6 +2647,7 @@ struct ScenarioEditorToolbarWindow : Window {
 			case MTEHK_SIGN:                   cbf = ToolbarScenPlaceSign(this); break;
 			case MTEHK_MUSIC:                  ShowMusicWindow(); break;
 			case MTEHK_LANDINFO:               cbf = PlaceLandBlockInfo(); break;
+			case MTEHK_PICKER:                 cbf = PlacePickerTool(); break;
 			case MTEHK_SMALL_SCREENSHOT:       MakeScreenshotWithConfirm(SC_VIEWPORT); break;
 			case MTEHK_ZOOMEDIN_SCREENSHOT:    MakeScreenshotWithConfirm(SC_ZOOMEDIN); break;
 			case MTEHK_DEFAULTZOOM_SCREENSHOT: MakeScreenshotWithConfirm(SC_DEFAULTZOOM); break;
@@ -2755,6 +2757,7 @@ static Hotkey scenedit_maintoolbar_hotkeys[] = {
 	Hotkey(WKC_F10, "build_sign", MTEHK_SIGN),
 	Hotkey(WKC_F11, "music", MTEHK_MUSIC),
 	Hotkey(WKC_F12, "land_info", MTEHK_LANDINFO),
+	Hotkey((uint16)0, "picker_tool", MTEHK_PICKER),
 	Hotkey(WKC_CTRL  | 'S', "small_screenshot", MTEHK_SMALL_SCREENSHOT),
 	Hotkey(WKC_CTRL  | 'P', "zoomedin_screenshot", MTEHK_ZOOMEDIN_SCREENSHOT),
 	Hotkey(WKC_CTRL  | 'D', "defaultzoom_screenshot", MTEHK_DEFAULTZOOM_SCREENSHOT),