Add ability to set goals with effective from date

[EmilJunker]

This PR adds the ability to set new nutrition goals without overwriting your previous goals (closes #519).

To do this, I completely reworked the way nutrition goals are stored by the app. Instead of

"goals": {
  "calories": ["2000", "", "", "", "", "", ""],
  "calories-shared-goal": true,
  "calories-show-in-diary": true,
  "calories-show-in-stats": true,
  ...
},

you can now have a whole list of goals per nutrient:

"goals": {
  "calories": {
    "show-in-diary": true,
    "show-in-stats": true,
    "goal-list": [{
        "shared-goal": true,
        "goal": ["2000", "", "", "", "", "", ""]
      },
      {
        "effectiveFrom": "2022-03-26T00:00:00.000Z",
        "shared-goal": true,
        "auto-adjust": true,
        "goal": ["2200", "", "", "", "", "", ""]
    }]
  },
  ...
},

The goals in the list may have an effectiveFrom date that is used to determine which goal should be used on a given day.

[davidhealey]

My only suggestion would be to change effectiveFrom to effective-from to maintain consistency with the other object keys. Although I prefer camel case so I have no idea why I went the - route to begin with (perhaps I was copying something else) :)

[EmilJunker]

change effectiveFrom to effective-from

Oh, I didn't even notice. Sure, I can do that.

[EmilJunker]

change effectiveFrom to effective-from

Done