cleanup the UI of the Output console

[devoncarew]

Output is not a great name for the results of embedded tools.

1. rename to Tools output
2. make it separate from user generated output

[devoncarew]

Removed this from the M3 milestone.
Added this to the Later milestone.

[devoncarew]

Fixed in https://codereview.chromium.org/148963014/.

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Added Fixed label.

[clayberg]

Removed this from the Later milestone.
Added this to the 1.2 milestone.