Improved Recording Workflow, Dropbox Controls, and New Emoji Stamps

* Added a ready to record window to review settings and device selections before recording.
* Snagit now optimizes videos for faster upload and availability when sharing to Screencast.
* Improved the “Scale to fit page” print option for captures smaller than one page. Margins are now smaller to allow the image to scale up further.
* Improved performance of Grab Text.
* Added new 👍 👎 🤞 🙏 🤷 emoji stamps to the smileys and people category.
* Added the ability to rename or overwrite an existing file when sharing to Dropbox.
* Added the ability to cancel a share to Dropbox.