feature requests: Changing order in diary + changing food entry time stamp + diary categories

[x-flc-x]

Hey @davidhealey,
loving your app. Great work and I hugely appreciate it!

Non an issue but rather some feature requests / suggestions:

• It would be great if one could change the order of the food entries in the diary similar to the body stats settings
• Changing the time stamp of food entries would be nice
• It would be great if when changing the diary entry categories (such as breakfast, lunch & dinner) the change would only be applied for future entries and not relate to past entries (for example when adding categories such as "snack between breakfast and lunch" in between)

Thanks for providing us with such a great foss solution! :)