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Move the layer specification to a typedef for better documentation. Make sure all layer types use typedefs.
Fix issues with the layer id function.
Ensures that canvas and renderer can actually be specified when creating a layer. This allows layers to share a renderer or a canvas. For the webgl renderer, sharing a canvas results in flashing, as each layer completely redraws the canvas. When sharing a renderer, there is no proper support for opacity (probably not for visibility) or z-order, but this is a first step to implementing #942.
Removed some unused code.