Process variable-containing strings as one token

A Manzerrequested to merge
19-Variables-in-strings into main

puppet-lint parses and separates double-quoted strings that contain variables into many types of tokens. For our purposes here, we just care about the string as a whole.

Adds a tight loop when encountering the beginning of a double-quoted string with a variable, and looks for the end before continuing.

Adds debugging capability for VSCode to the project.

Closes #19 (closed)

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