Update to sharing panorama

Bug: 7150324

Use separate share intents for sharing panoarma and regular JPGs.

If photo is a 360 panorama, promote sharing it on the action bar,
and move sharing as JPG to overflow menu.

MIME type changed to specify panorama360.

Change-Id: I8d52733d105820ac17ff36a6ad9d7525893f6d27