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There's a serious problem with the design so far, where symbols are used
for attribute names (intensity, strobe, colour etc), and also for
attribute values (on, off, random etc). There's no way for 'at' to
tell the difference between the two. For example, this form is
ambiguous: (at myfixture 'strobe 'on)
This commit introduces a new class, <starlet-attribute>, to replace the
use of symbols here. The attributes are enumerated in (starlet attributes),
and new ones can be added later. The attribute objects remember their
'canonical' names, to allow states to be printed.
Apart from solving the ambiguity problem, this has two further
advantages. First, attribute names no longer need to be quoted
everywhere. Second, multiple names can be used to refer to the same
attribute. For example: (define color colour).
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