Add json parsing into simple key/value dict compatible format

[bovine]

The "json" package http://tcllib.sourceforge.net/doc/json.html offers a ::json::json2dict method that outputs an easy to parse key/value list that can be loaded directly into a dict or an array to access individual elements:

{Country US Latitude 37.7668 precision zip State CA City {SAN FRANCISCO} Address {} Zip 94107 Longitude -122.3959} {Country US Latitude 37.371991 precision zip State CA City SUNNYVALE Address {} Zip 94085 Longitude -122.026020}

However, yajltcl's parse currently returns this, which is ponderously complex to mechanically navigate and extract just the value you want:

array_open map_open map_key precision string zip map_key Latitude number 37.7668 map_key Longitude number -122.3959 map_key Address string {} map_key City string {SAN FRANCISCO} map_key State string CA map_key Zip string 94107 map_key Country string US map_close map_open map_key precision string zip map_key Latitude number 37.371991 map_key Longitude number -122.026020 map_key Address string {} map_key City string SUNNYVALE map_key State string CA map_key Zip string 94085 map_key Country string US map_close array_close

[bovine]

fixed!