Daniel599 0e36ce4d60 Reset font size key bindings (#3505)
## Summary of the Pull Request
This PR implements resetFontSize keybindings, with default keybindings `ctrl+0`.

## PR Checklist
* [x] Closes #3319
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [ ] Tests added/passed
* [ ] Requires documentation to be updated

## Validation Steps Performed
Tested manually.
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* Add resetFontSize keybindings (#3319)

* update doc files

* Refactor AdjustFontSize & ResetFontSize to use _SetFontSize (#3319)

* Ran clang-format on TermControl

* Fix function usage change
2019-11-25 11:35:10 -06:00
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