Extend style options to support basic adaptive cards style

[a-b-r-o-w-n]

Currently only passes font family and font colors through

Added

• component: Allow font family and adaptive cards text color to be set via styleOptions, by @a-b-r-o-w-n, in PR #1670

[a-b-r-o-w-n]

@compulim I'd like your opinion on this.

I made these changes based on the themes in Emulator. I think that allowing users to override the host config handles the extreme case of needing to fully customize the adaptive cards config. This change only passes a few things from the style options through.

Let me know what you think. We could extend this and add more options to styleOptions, but I thought that would not be necessary since the override already exists.

[coveralls]

Pull Request Test Coverage Report for Build 915

• 2 of 2 (100.0%) changed or added relevant lines in 2 files are covered.
• 12 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.08%) to 52.466%

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Files with Coverage Reduction	New Missed Lines	%
packages/bundle/src/createDirectLine.js	3	20.0%
packages/component/src/Utils/TimeAgo.js	3	70.59%
packages/component/src/Utils/Timer.js	6	33.33%

Totals
Change from base Build 889:	-0.08%
Covered Lines:	878
Relevant Lines:	1522

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💛 - Coveralls

[a-b-r-o-w-n]

@compulim or @corinagum How should I proceed with the failing image snapshots?

[corinagum]

@a-b-r-o-w-n were there slight color changes? that's the only difference I can see in the snapshots.
https://webchattest.blob.core.windows.net/travis-result/2019/01/31/gy262/index.html
If that's the case, you can delete the failing images and run the tests locally again to push up the new png's. :)

[a-b-r-o-w-n]

@corinagum ah. yes. probably because of this: https://github.com/Microsoft/BotFramework-WebChat/pull/1670/files#diff-27cc33be5272a601ab9ad5a925024b12R20. I'll revert that and see if it passes.

[corinagum]

I know you're waiting for @compulim's input. Just wanted to throw in that this looks good to me! We should definitely get this in before my ConnectivityStatus PR so that I can emulate these changes in the components I made.