Make review comments standout more from the surrounding code
Make review comments standout more from the surrounding code

Review comments are now using the same size font, so the text is a
bit larger and easier to read.  They also use up a bit more screen
space vertically, so its easier to notice the comment block.

Comment sections have a thick orange border on the left and right side,
making them stand out visually from the other parts of the file.
We also color them with a light-peachish background color, which is
visually distinct from the light green or red used on other lines.

Bug: GERRIT-72
Signed-off-by: Shawn O. Pearce <f3ea74d906fa9fe97c1fef6bad9cb871485c7045@google.com>

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