[15] Enable players to confirm they are available directly from the email

[toepoke]

We used to use groupspaces which had this feature and people loved it. People don't like having to log in to confirm esp. as most of them get the email on their phone.

Created:
Mar 5, 2014

Votes:
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[toepoke]

Feature completed. Will be in next release, 2.0.0002.