Add support for encryption/decrypt from HTML Textareas.

[bkero]

It would be neat and useful to be able to use Babble to arbitrarily encrypt and decrypt from HTML textareas located on various web pages.

[yvbbrjdr]

Sorry, can you elaborate on this feature a bit? If it's encrypting/decrypting the text in place in the textareas, we are actually actively avoiding implementing this feature, as websites might have event listeners on those textareas and steal the plain text from the user, which defeats the purpose of Babble. That's why we, in our design, only put encryption/decryption and decrypted text outside the reach of the webpage.

That said, context menu decryption (which shows the decrypted text in the iframe) is in our plan.