Cast Bar & Icon options[Option Added]

Part of My Plater Scripts & Mods Collection : https://wago.io/4PDCiFEGE

Basically it works same way as Tercioo or Continuity's castbar border and anchor mods work.

3 differences are

1) Shield icon is from blizz original

2) Has an option for toggle big/small icon(envTable.BigIcon)

3) Has an option for anchor icon inside castbar(envTable.InsideBar)