preactjs / preact / 4912

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Pull #1797

travis-ci

TS: improve typing of "style" attribute using CSSType

This commit uses the CSSType, which provides TypeScript and Flow definitions for CSS, generated by data from MDN. It provides autocompletion and type checking for CSS properties and values.

The library is used by [most other popular css-in-js frameworks](https://www.npmjs.com/browse/depended/csstype) for TS typechecking, including:
- [@types/react](https://github.com/DefinitelyTyped/DefinitelyTyped/blob/2ccc2ff36/types/react/index.d.ts#L1656)
- [@material-ui/styles](https://github.com/mui-org/material-ui/blob/4d8206d3d/packages/material-ui-styles/src/withStyles/withStyles.d.ts#L14)
- [@types/styled-components](https://github.com/DefinitelyTyped/DefinitelyTyped/blob/4e23957ab/types/styled-components/index.d.ts#L25)
- glamorous
- csx
- @types/jss

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