Allow to extend auto-completion list for meal entries using custom items

[Programie]

Right now, the auto-completion list for meal entries only shows existing meals and items from a data source provider like Tandoor Recipes.

In some cases, it might be helpful to have additional options to choose from, like leftovers from previous/existing meals.

For example, the following meals are available in the auto-completion list:

• Bread with honey
• Butter Chicken
• Thai Curry

By configuration, it should be possible to extend the list to something like:

• Bread with honey
• Leftovers of Bread with honey
• Butter Chicken
• Leftovers of Butter Chicken
• Thai Curry
• Leftovers of Thai Curry

This could be done by providing a list of patterns which could be used to duplicate the existing items in the auto-completion list.

A pattern could look like Leftovers of {item}.