• remove some array declarations on instruction drawImageByPos, 2b9d76e
  hoping that it could make the rendering less demanding by even just a tiny amount if it helps
• change default background color to transparent 4c680b0
  Now it will be shown transparent on streaming softwares that don't support the custom css feature. The reason I didn't want to do this was the skins look better on black background, and browser will default to white when it's told to set it transparent. And the browser is probably where the first impression is made, if one doesn't discover it first from someone else's stream.
• polishment on Biker skin 5656232