Part of the token grammar permits so-called "decorated" types. These
are tokens that are pointer, array, map, or function types. For example:
* `*any`: a pointer to anything.
* `[]string`: an array of primitive strings.
* `map[string]number`: a map from strings to numbers.
* `(string,string)bool`: a function with two string parameters and a
boolean return type.
* `[]aws:s3/Bucket`: an array of objects whose class is `Bucket` from
the package `aws` and its module `s3`.
This change introduces this notion into the parsing and handling of
type tokens. In particular, it uses recursive parsing to handle complex
nested structures, and the binder.bindTypeToken routine has been updated
to call out to these as needed, in order to produce the correct symbol.
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