* added optional authority parameter for authing methods.
* removed Signer calls from httping. moved them to the upper level (authing)
* refactor siginput and desiginput method to make them reflect each other
* desiginput return value changed to map by signature label. According to the RFC the labels must be unique
* added sigbase method to httping. It is now used in both sign and verify authing functions
* authing.test.ts: mock httping methods.
* added RFC test cases