Use underscores instead of spaces for all internal names. And renamed some script functions at the same time.

* cannocial_name_form now outputs "_", where it used to use " "
* this simplifies reflectio and scripting code, because now C++ names are also MSE internal names
* added 'caption' property to fields. This is used instead of the name in NativeLookEditor, since the latter will now contain underscores.
* renamed text related script functions for consistency, since we were touching that part of the code anyway.

src/gui/control/card_list.cpp

@@ -237,7 +237,7 @@ void CardListBase::rebuild() {
     else if (f.second->card_list_align & ALIGN_CENTER) align = wxLIST_FORMAT_CENTRE;
     else                                               align = wxLIST_FORMAT_LEFT;
     InsertColumn((long)column_fields.size(),
-                 tr(*set->game, f.second->card_list_name, capitalize),
+                 tr(*set->game, f.second->card_list_name, identity),
                  align, cs.width);
     column_fields.push_back(f.second);
   }