Card data in images (minimum viable)

* remove wxEmptyString

* improve style tab carousel

* create web request window

* add drop target and drop source

src/data/field/text.cpp

@@ -206,7 +206,7 @@ void FakeTextValue::retrieve() {
   if (underlying) {
     value.assign(untagged ? escape(*underlying) : *underlying);
   } else {
-    value.assign(wxEmptyString);
+    value.assign(_(""));
   }
 }