AreaChart:With steps, fmt and labels

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Build 1137692cdea
Current build. There are unaccepted changes, so build 927 is still the baseline.
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Build 85522c35f6
Accepted by Zach Stence.
Build 852bab0b35
Accepted by Zach Stence.
Build 8426623eea
Accepted by Zach Stence.
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