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/data/field/choice.cpp

@@ -192,7 +192,8 @@ void ChoiceStyle::initImage() {
   //      OR_ELSE
   ScriptCustomCollectionP lookup(new ScriptCustomCollection());
   FOR_EACH(ci, choice_images) {
-    lookup->key_value[ci.first] = ci.second.getValidScriptP();
+    lookup->key_value[uncanonical_name_form(ci.first)] = 
+      lookup->key_value[ci.first] = ci.second.getValidScriptP();
   }
   Script& script = image.getMutableScript();
   script.addInstruction(I_PUSH_CONST, lookup);
@@ -270,7 +271,7 @@ template <>           void reflect_content(GetMember& tag, const ChoiceStyle& cs
 }
 
 IMPLEMENT_REFLECTION(ChoiceStyle) {
-  REFLECT_ALIAS(300, "card list colors", "colors card list");
+  REFLECT_ALIAS(300, "card_list_colors", "colors_card_list");
   REFLECT_BASE(Style);
   REFLECT(popup_style);
   REFLECT(render_style);

src/data/field/information.cpp

@@ -63,7 +63,7 @@ String InfoValue::toString() const {
   return value;
 }
 bool InfoValue::update(Context& ctx) {
-  if (value.empty()) value = field().name;
+  if (value.empty()) value = field().caption;
   bool change = field().script.invokeOn(ctx, value);
   Value::update(ctx);
   return change;

src/data/field/multiple_choice.cpp

@@ -53,7 +53,7 @@ IMPLEMENT_REFLECTION_NAMELESS(MultipleChoiceValue) {
 
 bool MultipleChoiceValue::update(Context& ctx) {
   String old_value = value();
-  ctx.setVariable(_("last change"), to_script(last_change));
+  ctx.setVariable(_("last_change"), to_script(last_change));
   ChoiceValue::update(ctx);
   normalForm();
   return value() != old_value;