Implement fancy format string analysis.

* module/language/tree-il/analyze.scm (format-string-argument-count):
  Return two values, the minimum and maximum number of arguments.
  Add support for most of `format' escapes, including conditionals.
  (format-analysis): Adjust accordingly.

* module/system/base/message.scm (%warning-types)[format]: Take two
  arguments, MIN and MAX, instead of EXPECTED.  Display warning
  accordingly.

* test-suite/tests/tree-il.test ("warnings")["format"]("~%, ~~, ~&, ~t,
  ~_, and ~\\n", "~{...~}", "~{...~}, too many args", "~@{...~}",
  "~@{...~}, too few args", "~(...~)", "~v", "~v:@y", "~*", "~?",
  "complex 1", "complex 2", "complex 3"): New tests.
  ("conditionals"): New test prefix.

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