Implement grouped headers.

Fixes: 32943152
Fixes: 33203390
Fixes: 33105914

-Add divider
-Adjust padding to better match spec
-Make HistoryFormula/Result padding match DisplayFormula/Result padding

Change-Id: I5e5a7e61079b6d1367bf61f4c88dd79555f4bcb7
9 files changed