Add ability to show goal progress and remaining nutrition allowance in diary bottom bar

[EmilJunker]

This PR adds the ability to see your goal progress and remaining nutrition allowance in the diary bottom bar.

Here is an example of the diary bottom bar where

• the carbs goal has not been reached yet,
• the sugars goal has already been overshot, and
• the fiber goal has also been overshot (but it's a minimum goal, so that's a good thing)

If you toggle the view by tapping on the diary bottom bar, it shows this:

• the carbs goal is about 90% complete (you need another 35.56g of carbs to reach it),
• the sugars goal has been overshot by about 40%, (you ate 42.6g too much) and
• the fiber goal has been overshot by about 10% (you ate 3.2g too much, but that's a good thing)

And this is how it looks in dark mode:

You can toggle between the views by tapping on the bottom bar. This does not interfere with the ability to swipe left and right.

Closes #565. Closes #442. Closes #324.

[davidhealey]

Thank @EmilJunker I have some plans to overhaul the nutritional display in the diary which will include similar functionality. But as I probably won't get around to doing that until at least next year this is a very welcome addition!