Security updates and various fixes

We now require researcher accounts to have a much stronger password (at least 16 characters including special characters). We are planning to introduce more passwordless authentication methods in the future in addition to the currently available Google login.

• Fixed an issue with clips getting created with a few seconds off the selected region. This was a temporary issue caused by our last fix to the session start timer.
• We have fixed a rare issue when session confirmation emails didn't have the start time in them.