Android: Auto-set From: to recipient alias on reply (catch-all / dynamic alias support)

[SuperS]

My private secret email address is person@example.org
I make lots of aliases, eg: foo-bar-baz.qux@example.org

When we reply, check if any of the To addresses match:
* Option 1: Matches *@example.org
* Option 2: Per account regex
eg: 

/^foo-[^@]{,100}@example\.org$/

Then simply set my From address as the matched address.

Benefits:
* Avoid spam
* Maintain privacy of your main email address
* Avoid accidentally replying from your private email address
* If your alias gets onto a spam list, delete the alias and make a new one
* We don't need to add all of our aliases into our android email client
* Set once, works for unlimited current and future aliases

[Jon]

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