Move change id and status to left side of ChangeScreen2

Some users have reported missing the subject line and only reading
the commit message body on ChangeScreen2.  The subject is bold and on
a "trimColor" (e.g. grey) background while the message body is on the
page background color (e.g. white).  This coloring makes the subject
appear to be unrelated to the message, and reviewers find themselves
missing important context when trying to understand the commit.

Move the subject line down into the commit message body area and
slide the change number and status into the left 1/3rd of header
line bar.

Change-Id: I61c3143c636e234776189d545def9ff528eaa2bf
3 files changed