Simplify the switch statement in input_events_cb()

One of the things we check for is the keys 1-9 to select a movie to
play. Rather then specifying each of CLUTTER_1 to CLUTTER_9 we can
simply specify the sequence 1 to 9 i.e

    case CLUTTER_1...CLUTTER_9:

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
Update the copyright years

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
Declare global variables as static

This is good practice when they aren't required elsewhere and negates
the need to initialise them to 0/NULL.

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
When reading in the images ignore . and ..

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>