New goals screen

[OliverLSanz]

Change the existing Goals screen to make each goal list item an accordion that can be expanded to show that goal's activities.

[OliverLSanz]

I think there are layout issues that makes the screen difficult to understand without paying close attention to it. They should be resolved.

• The "Activities" header appears with the same layout of a list item. IMO because of this it can be confused with another goal or activity.
• If we reduce the size of the "Activities" header, it would be good to replace it or add an actual list item to empty goals, that reads something like: "Add first activity".
• The only thing that visually differentiates the goal list from the inner activity lists are dividers placed at the boundaries of the activity lists. This visual differentiation is not enough, specially when there are two activity lists expanded at the same time as seen in the screenshot.
• Probably it should not be possible to have two Goals expanded at the same time.

[OliverLSanz]

Another thing: the Goal Screen does not make any sense (related to the new Goals Screen) because it basically has the same content.

But it can't be removed either, because that is the only (obvious) place when we can:

• View the motivation
• Edit the goal (also present in long press menu of GoalsListItem)
• View archived activities (also present in long press menu of GoalsListItem)
• Archive the goal (also present in long press menu of GoalsListItem)

If it wasn't for the motivation, a three dots menu with all those actions could be added to the GoalsListItem to completely remove the GoalsScreen.

We also need to have in mind that future extensions to goals that could make the Goal Screen necessary are possible (and probably give it content to differentiate from the content present in the Goals Screen).

[OliverLSanz]

We could merge this screen before polishing it, to do some testing of it integrated with the recent changes. But for this we should be able to switch back to the old screen easily. We should modify this changes so that they don't destruct the previous version.