* Moved server/lib/utils.js to Typescript
* moved _app.js to Typescript
* Moved _error.js to Typescript
* Added argument for custom props in _app and _error
* Moved _document.js to Typescript
* updated one test
* Updated types and added a validation for _document props
* Improved types
* Fixed some types
* Updated AppType
* Fixed some tests
* Added missing import
* Removed a not very useful type
* Fix missing type
* Move @types/styled-jsx
* Fix typescript errors
Fixes#5845
Implement tslint for core files
**What is this?**
Implements tslint for both next and next-server, but keeps standardjs/eslint for the .js files that are still there, we're gradually migrating to Typescript.
**How does it work?**
Before every commit (pre-commit) we execute the following `tslint` command:
`tslint -c tslint.json 'packages/**/*.ts`
**TSLint Rules**
In order to avoid as much changes as possible I marked some rules as false. This way we can improve the linter but making sure this step will not break things. (see tslint.json)
**Note**
After merging this PR, you'll need to update your dependencies since it adds tslint to package.json
