Update version number to 2.0

Handwriting support was originally added as 1.4, but has been
updated to 2.0 in this commit.

Since the major version number has changed, all the components
must be registered with the new major version number.

Change-Id: I34c74f5dd24684423d153ff85a4a24eed8d4ffd1
Reviewed-by: Mitch Curtis <mitch.curtis@theqtcompany.com>