live mode dashboard / clean up

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What does this PR do?

• live mode dashboard - the ability to display custom text and print values on live mode screen
• new alt-d shortcut for the above
• new ops for the above LIVE.DASH, LIVE.VARS, LIVE.GRID, LIVE.OFF and PRINT
• general clean up: clang format on everything, missing commas in help mode, missing stuff in whats_new

How should this be manually tested?

see the doc for the LIVE.DASH op

I have,

• [x] updated CHANGELOG.md
• [x] updated the documentation
• [x] updated help_mode.c (if applicable)
• [x] run make format on each commit
• [x] run tests

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the tests were definitely passing locally, not sure why travis is complaining, will take a look

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the tests are failing on ops added in #PR257. @attejensen can you take a look?

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so looks like clang format broke some of the ops - which is why the tests passed for me locally - i ran clang format after. should be fixed now.

[desolationjones]

so looks like clang format broke some of the ops - which is why the tests passed for me locally - i ran clang format after. should be fixed now.

Won't these break every time they are formatted? Perhaps we should wrap that section in a // clang-format off.

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@desolationjones math.c already has clang-format off but it still modified it. not sure why..