Activity feed

A/C:
1. Has complex filters including custom fields on top
2. Has other filters (my/delegated, categories, attachment and highlighted) and display options on the second row
3. Show activity cards in the order of activity dates
4. Activities are grouped by activity dates
5. Show more button to show more activities on the page
6. Separator for current and past activities (see past activities panel header in design)
7. Display options: Show followup activities inline and Show overdue activities first
8. (Stage 2) Be able to select more than one activities and perform a bulk action