Breaking: convert type of all primary keys to uuid4

[norbye]

Change all primary keys to be of type uuid4.

Best reason to do so is to prevent people from seeing how many applications are sent by looking at their application id. In addition it's practical to not have to convert between string and number all the time. Other than that I see few reasons not to do so (except for the obvious tedious bits in the test when creating users and groups).

To change the types of the IDs I had to reset all the migrations, which requires everyone to reset their databases (and the prod and staging ones, which I'll fix when I'm merging this).

Fixed some other minor stuff while I was at it;

• Links to abakus.no now differentiate between revue groups and committees
• You can still view an admission outside the deadline if you enter the url directly, but it is not possible to submit an application

Resolves ABA-165
Resolves #1210, #281

I'm still considering the id change for LegoUser and Group, so if anyone has any thoughts I'm open for it.

[linear]

ABA-165 Change to UUIDs on comittee-admissions

[ivarnakken]

nice