Convert a vector of colon-separated text lines into a list of named elements
listify(colon_sep_xs)a character vector with lines of the form
"key: value"
a named list of the values in the colon-separated lines.
"key: value" yields list(key = "value")
Some minor cleaning of the input is performed:
Lines without a colon-space separator ": " are filtered out.
Once the strings are split at the separator, white-space on the left and right sides of each half-string is omitted.