Add movetopoint(screen, x, y)

Adds posibility to move cursor to given point on given screen

Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
Add screen function to get screen on which pointer is currently

Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
Add show function to show up the cursor