Weeknumber watch face

Same as simple clock, but has iso 8601 week number instead of seconds counter

movement/movement_faces.h

@@ -58,6 +58,7 @@
 #include "frequency_correction_face.h"
 #include "alarm_face.h"
 #include "ratemeter_face.h"
+#include "weeknumber_clock_face.h"
 // New includes go above this line.
 
 #endif // MOVEMENT_FACES_H_