Improve protected string support

[Jc2k]

Rename to yay.string.String, and deprecate ProtectedString

Ensure that constructor actually calls self.add() so that raw strings passed to a ProtectedString are wrapped

To support more uses cases like building a command line as a list, support accessing an unprotected and protected list

class String:

    @property
    def protected_parts(self):
        """ Return a list of all string parts with obfusication """

    @property
    def unprotected_parts(self):
        """ Return a list of all string parts with no obfusication """

[Jc2k]

Fix on master.