Completely removes the pin code authentication from qml. The config
option in the wallet preferences has been renamed to "Payment
authentication" and now either asks for the Android system
authentication (Biometric or system pin/password) if enabled or will ask
for the wallet password as fallback.
This guards function calls by storing the function, args and kwargs into
an added attribute '__auth_fcall' on the object using the decorator,
then emits a signal that can be handled by the UI.
The UI can signal auth-success or auth-failure back to the object by
calling either the authProceed() slot or the authCancel slot.
The object utilizing this decorator MUST inherit/mixin the AuthMixin
class, which provides the above two slots, and handling of state.
The decorator also accepts a 'reject' parameter, containing the name of
a parameterless function on the object, which is called when
authentication has failed/is cancelled.
user