This replaces the current usage of stream names with stream ids.
This commit also removes the `traditional` attribute from the invite
form as now we are sending stream_ids as an argument; this was the
only place in the codebase we used traditional=true, and it's great to
have it removed.
Previously, zerver.views.registration.confirmation_key was only
available in development; now we make that more structurally clear by
moving it to the special zerver/views/development directory.
Fixes#11256.
Some urls are only available in the development environment
(dev_urls.py); Corresponding views (here email_log.py) is moved to the
new directory zerver/views/development.
Fixes#11256.
Anders Kaseorg
Shubham Dhama
Vaibhav