annotate: Add options to move the text and set justification
annotate: Add options to move the text and set justification

Adds extra fields to the IL and MMAL parameters to set justification
as centre/left/right, and add an x and y offset.
Retains backwards compatibility

6by9/userland,JamesH65/userland,JamesH65/userland,6by9/userland,6by9/userland,JamesH65/userland,raspberrypi/userland,raspberrypi/userland,raspberrypi/userland