Added new keyboard for Tutorials

[android272]

Four new keyboards added under the Tutorial Category. Two Dark, Two Light, Two different Mouse images for each. Light/Dark Modern Mouse, and Light/Dark Gamer Mouse added. Both Shift, CTRL, and ALT keys are stacked on top of each other in their own stacks while all other keys are stacked on each other with a blank key to hide all other keys.

[mnoreke]

This is exactly what I have been looking for. I pulled down the branch to test it out to make sure and boy am I happy I did. Thank you! :)