Redesign the edit datapoint view

[theospears]

This provides a new look for the edit data point view. In particular:

• The date picker now works as you might expect
• It uses styles more consistent with iOS system defaults
• It's a formSheet rather than a full screen takeover

Testing:

• Loaded on simulator on iOS15-17
• Tested changing a data point
• Tested deleting a data point

[theospears]

Current dependencies on/for this PR:

• master
  • PR #413 👈

This comment was auto-generated by Graphite.