Bug 1023662 - [User story] Show 5 day week view r=gaye

**WIP**, still going to clean up the code and try to use external templates for most of the elements.. I have a few more changes locally (trying to abstract it better so that we can use same logic for day view as well), but will probably take another full day to clean up the code..

I'll rebase this later and squash commits.
we can't because DB was not working properly inside this test file (I was getting some errors), operations are async which would make the tests way more complex (cached data between tests, not relying on `clock.tick`, etc..)