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/native_look_editor.cpp

@@ -44,7 +44,7 @@ void NativeLookEditor::drawViewer(RotatedDC& dc, ValueViewer& v) {
     dc.SetFont(*wxNORMAL_FONT);
     dc.SetTextForeground(wxSystemSettings::GetColour(wxSYS_COLOUR_BTNTEXT));
     // TODO : tr using stylesheet or using game?
-    dc.DrawText(tr(getStylePackage(), s.fieldP->name, capitalize_sentence),
+    dc.DrawText(tr(getStylePackage(), s.fieldP->caption, identity),
           RealPoint(margin_left - s.left, 1));
   }
   // draw viewer
@@ -68,7 +68,7 @@ void NativeLookEditor::resizeViewers() {
         // width of the label string
         int w;
         Style& s = *v->getStyle();
-        String text = tr(getStylePackage(), s.fieldP->name, capitalize_sentence);
+        String text = tr(getStylePackage(), s.fieldP->caption, identity);
         dc.GetTextExtent(text,&w,nullptr);
         label_width = max(label_width, w + label_margin);
       }