More screencaps added

I added screencaps from several features/specials including Billie’s 1999 Holiday message, a behind the scenes look at the ‘Walk of Life’ video, and a clip of Billie’s trip to Mexico during the ‘Walk of Life’ era.

I apologize for the caps being somewhat out of order, sequence-wise. I tried multiple times to get them added correctly but Coppermine didn’t want to cooperate! I also re-arranged the ‘TV Appearances’ category of the gallery and divided it into sub-sections to make it look cleaner and more organized. Enjoy!