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travis-ci

chore: Add eslint/prettier (#227)

* Add and configure `eslint` and `prettier` for the monorepo; add a `lint` script accessible via `yarn lint`
* Remove `tslint`
* Add a `typecheck` script to the monorepo and each package; given that `tslint` used to do this, and `eslint` doesn't, it needs to be run separately
* Codemod: run `yarn lint` on the project, which leads to some minor changes (e.g. spaces before function names, which sadly [isn't supported by Prettier](https://github.com/prettier/prettier/issues/3847)
* All rules with errors that couldn't be trivially fixed have been disabled; these should be re-enabled gradually
* Made some small adjustments/eslint disabling for some files due to differences between tslint and eslint semistandard
* Fixed a bug with the `inTraceFilter` formatter thanks to eslint

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