Export files are now directly under the module folder,
e.g. `core/core.js`. With this, an import like `core/core`
won’t need a path mapping (e.g. via `System.paths`) any more.
This adds the `src` folder to all other import statements as well.
- use performance log of chromedriver / appium to get timeline data
for calculating metrics for benchmarks
- change all benchmarks to be made of a standalone application
and a protractor test that collectes timeline data
- fix and simplify benchmarks
- add dart2js to build
- remove benchpress
Closes#330