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* Dries up GN rules for Metal and OpenGL ES shader compilation and embedding in a target binary. * Adds support for shader compile time macro definitions. This is so that workarounds for specific shader backends can be implemented. In the case of this patch, there are temporary OpenGLES workaround for users of instancing and SSBOs. These will be removed when I rework glyph rendering to not use these features that are missing in legacy targets. * Since there is no concept of an OpenGLES shader library akin to a `.metallib`, adds a target called `blobcat` that concatenates shader blobs into single blob that can be embedded into a target binary. No parsing or data copying is necessary. * `imgui_raster.vert` has been rewritten to work around the absence of unsigned integer types in legacy backends.
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