* Extract advanced gas input controls to their own component
* Add advanced inline gas toggle to settings
* Add optional advanced inline gas to send send screen
* Adds optional advanced gas inputs to the confirm screen
* Add info modals for advanced gas inputs.
* Fix translation of advance gas toggle description.
* Lint and unit test fixes for inline-advanced-gas-inputs
* Increase margin above advanced options button on send screen
* Move methods from constructor to property syntax in advanced-gas-inputs.component
* Show user warning if they set gas price below safelow minimum, error if 0.
* Properly cache basic price estimate data.
* Default retry price to recommended price if original price was 0x0
* Use mock fetch in send-new-ui integration tests.
Dan J Miller