Function globals canvas MapStructure SingleSymbolLayer new

Default implementations/values:
@param group A group to place this on.
@param map The #Canvas.Map this is a member of.
@param controller A controller object (parents=[SymbolLayer.Controller])
or implementation (parents[0].parents=[SymbolLayer.Controller]).
@param style An alternate style.
@param options Extra options/configurations.
@param visible Initially set it up as visible or invisible.