implement ttypescript transfomer plugin for rollup-plugin-typescript2

[quantizor]

Plugin: https://www.npmjs.com/package/ttypescript

The main benefit of this build plugin is the easy enabling of using TS "transformers" which are not a mainstream part of TypeScript core just yet. This includes ones like: https://github.com/Igorbek/typescript-plugin-styled-components

Closes #719

[changeset-bot[bot]]

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Latest commit: 5c349cb294a1a2dd6b9639adb2b0125bd20a2cfd

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