Fix: typed options passed without a value now fail validation (fixes #38) - #65
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A typed option given as a bare flag (for example --limit with a type of int) used to be skipped by validation and reached the command as true. Validation now reports a type error for any non string value, and a new flag type lets definitions opt into valueless options. Adds tests for the error, the flag type and that typed options with values still validate.