Move to IBootstrap

[PVince81]

This makes sure that the late setup is correctly running and removes the
hack where it was added to routes.php.

• try and port the init code to use the passed-in context where possible

[PVince81]

so now I've moved everything to the boot() method except for the two event classes that I could register earlier.

now, while testing:

• BUG: app whitelist not working: I can see dashboard app visible and access it and also the comments tab => for some reason IUserSession->getUser() is null, so the restriction is not in place => resolved by swapping initialization order
• TEST: notification: use "migrate_guest_user_data" config setting, see README => notification appears for migrated user
• TEST: creating guest + dropdown values
• TEST: guest list in settings page
• TEST: share autoaccept event
• TEST: guests-main is loaded thanks to the event
• TEST: first login hook triggered
• TEST: post share hook triggered
• TEST: user/group backend registration: guest users are visible in users page
• TEST: cannot share with local users

[PVince81]

I've tested on master and on that branch IUserSession->getUser() returns non-null, so the problem is specific to the move to IBootstrap. So I'll debug deeper to find out when the latter is actually getting populated and why it's not in boot().
Maybe need a callback of sorts ?

Edit: solved, I mixed up the initialization order: 23c292b

[skjnldsv]

Looks great 🐘