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This PR refactors the skwasm renderer to use `DisplayList` objects as its main model objects instead of using Skia objects directly. Then, at render time, we dispatch the display list commands to the skia surface. This is a preparatory step for impeller on web. * Some build rules were reworked in order to allow `DisplayList` to compile via emscripten * Some pieces of the display list library were further refactored to allow us to compile it without actually building and linking the impeller shaders. The two major classes that needed to be separated out were `DlRuntimeEffect` and the text drawing system. * `SkPath` and `SkImage` are still used as the main model objects in skwasm. As of right now, `DisplayList` just thinly wraps these objects, so this is the minimal possible change for now. I will have to refactor this somewhat further when preparing for actual impeller adoption. * Several special cased code paths in skwasm were removed, as they are taken care of by `DisplayList` itself. This includes shadow drawing, determining when to enable dithering, and determining the right clamp value for filters.
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