Add: graphics settings and layer properties

[irgendwr]

BannerLayer options are currently undocumented.

Add @property's here: https://github.com/SinusBot/scripting-docs/blob/master/api/graphics.js#L11
Add example here: https://github.com/SinusBot/scripting-docs/blob/master/api/graphics.js#L39