More Lua functions; allow specifying ingredient type by ID

- avatar_setBlockBackflip()
- avatar_isBlockBackflip()
- inv_getNumItems()
- inv_getItemName()
- getIngredientDataSize()
- getIngredientDataName()

Aquaria/Continuity.cpp

@@ -165,6 +165,8 @@ IngredientType Continuity::getIngredientTypeFromName(const std::string &name) co
 		return IT_MUSHROOM;
 	else if (name == "Anything")
 		return IT_ANYTHING;
+	else if (name.length() && isdigit(name[0]))
+		return (IngredientType)atoi(name.c_str());
 
 	return IT_NONE;
 }
@@ -190,6 +192,16 @@ IngredientData *Continuity::getIngredientDataByIndex(int idx)
 	return ingredientData[idx];
 }
 
+int Continuity::getIngredientDataSize() const
+{
+	return (int)ingredientData.size();
+}
+
+int Continuity::getIngredientHeldSize() const
+{
+	return (int)ingredients.size();
+}
+
 Recipe::Recipe()
 {
 	known = false;