Introduce shiny pokemon to the whosthatpokemon app

[vaquierm]

Added the ability to randomly make the Pokemon shiny. (I am not the original creator of this app but thought it would be fun to add this!)

kyogreShiny.mov

A new parameter was added to allow the rate at which shiny Pokemon will randomly appear. By default, no shiny Pokemon will appear.

A shiny animation was also added so that sparkles appear just like a shiny encounter in the Pokemon games. To make the animation of the stars smooth the root delay was divided by 5 from 125 to 25. All other frame calculations were adjusted to make the experience look the exact same except for the sparkles.

[tidbyt]

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