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A character can't both be an alias and have its own bitmap data, so we may as well overlap them. Wrapping them in a union doesn't require any changes to the syntax of the glyphs array because C allows for incomplete bracketing of initialisers. Because the union doesn't have a name, its members can be accessed as though they're members of the containing struct, which means that accesses to them don't need to change. There is a new flag to mark a glyph as an alias since "alias_of == NULL" no longer works, and a corresponding change to the ALIAS() macro. This saves about 20K of bedstead's data segment on a 64-bit system, which is kind of silly but it's satisfying nonetheless.
