lexers/cue: support definitions and dollars in field names #935
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'$' is valid in a bare field name in CUE. It is not special. It happens to be used by convention at the start of field names, but that is about it.
Definitions start with '#'.
Add a "section" of tests that cover the various types of field. There are no errors in new "tests", whereas before (i.e. without the change to the CUE lexer) there would have been.