Support Pinch to Zoom for Reading Email

[shamust]

Steps to Recreate:

1. Open Thunderbird (115.9.0 (64-bit))
2. Get Messages
3. Double Click on an Email. Note that the font is small, and hard to read. You want to make it bigger!
4. On your touch screen, place your thumb and forefinger on the screen and open them.
5. Note that the email doesn't zoom in.

Expected Results: The email should zoom in THE SAME AS IF I HAD CLICKED Ctrl+.

[Jon]

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[shamust]

Conversely, when the client places their thumb and forefinger on the screen and closes them, the email should zoom out THE SAME AS IF I HAD CLICKED Ctrl-.