Use our fork of `skia-canvas` for rendering which handles
encoding characters correctly with the caveat font and other
similar fonts that can group glyphs like ligatures.
This resolves issues with pdf text extraction where characters
were unable to be extracted due to lacking any data within the cmaps.
This PR is handles the changes required to support envelopes. The new
envelope editor/signing page will be hidden during release.
The core changes here is to migrate the documents and templates model to
a centralized envelopes model.
Even though Documents and Templates are removed, from the user
perspective they will still exist as we remap envelopes to documents and
templates.
Lucas Smith
Abdelrahman Abdelhamed
David Nguyen