Functions in bucket.h

• gestures_bucket_add()
  Add a gesture to a gesture bucket.
• gestures_bucket_clear()
  Clear a gesture bucket.
• gestures_bucket_count()
  Return the number of gestures in a gesture bucket.
• gestures_bucket_del()
  Remove a gesture from a gesture bucket.
• gestures_bucket_get()
  Return the gesture at the specified index.
• gestures_bucket_init()
  Initialize a gesture bucket.