Add more settings options for calorie amount per meal

Problem: If i use the function to add my Activity Calories to the diary, the extra calories are distributed over all the meals, also the ones i already ate and tracked. But no one can go back in time, and eat another 100 cal for lunch in the evening.
Solution:
More options to manage calories per meal!
1) be able to set cal absolut amounts instead of percentages
2) be able to set that if a meal has been tracked that its closed for the day, so extra calories are only added to the left over meals.
3) be able to set that extra cal from activity are only added to the „Snacks“ meal
Reason: building healthy meal habits and getting used to the right serving sizes is far easier if u can plan ur meals in advance and always rely on the same recipe sizes, and not need to guess ur activity level in advance.