Remove inverse print functions

These have been overcome by events. If a fast vertical partial print is
needed (i.e. a left-to-right swipe function where a background image is
revealed) you can rotate the image 90 degrees and use the screen
rotation function to print the rotated item in the desired orientation.
This will allow the same quick partial prints.

Also removed the playGci function that was used for playing videos.
Duplicating this function is really easy and it's really not that useful
because it's a blocking function whereas using the videoFrame() function
allows much better 'threading'

Renamed the gci extension to a more generic and easier to understand raw
format.