Restructure the People tab

In circles-android#265 (closed) we talked about re-working the People tab, to split out the various sections into their own screens.

Now instead of showing the lists of users directly, the People tab will have navigation buttons and counts of people in each category:

• My Connections (32)
• People I'm Following (37)
• My Followers (44)
• Friends of Friends (581)
• Other Known Users (402)

This will reduce the work to render the basic People overview screen, and it will reduce the duplication - it's weird that Alice sees Bob under ALL the categories "My Connections", and "People I'm Following", and "My Followers", and "Friends of Friends", etc. This makes it harder to scan through the screen to find the person you're looking for. The duplicates make the user feel disoriented.

Now, with each section on its own screen, each person should appear only once in each list.