Breaking changes for v6.0.0

[JP Dillingham]

The existing Parse() has been replaced with three overloads.

Old:

public static Arguments Parse(string commandLineString = default(string), Type type = null, [CallerMemberName] string caller = default(string)) {}

New:

public static Arguments Parse(Action<ArgumentParseOptions> configure = null) {}
public static Arguments Parse(string commandLineString, Action<ArgumentParseOptions> configure = null) {}
public static Arguments Parse(string commandLineString, ArgumentParseOptions options) {}

The caller argument wasn't doing anything in the first place, and the type argument is now specified through the TargetType property of ArgumentParseOptions.

ArgumentParseOptions contains the following properties:

• TargetType -- same functionality as the previous type parameter
• CombineAllMultiples -- combines repeated argument values into a list
• CombinableArguments -- if CombineAllMultiples is false, combines the specified arguments into a list
  If TargetType is supplied and repeated arguments match a property in the type, the behavior remains the same; if the backing type of the property is a collection, values are combined, otherwise they are overwritten.

If TargetType is not supplied, or repeated arguments don't match a property in the type, the behavior depends on the other options for multiples, either everything or just those specified.