SIG_ALL signature flag for P2PK (#735)

* n_sigs_refund working, tests added

* update requirements

* wip sigall

* wip

* sigall works

* add signatures for refund

* add mint p2pk tests

* add more p2pk tests

* fix tests

* sign htlc pubkeys as well

* fix htlc and add new test

* fix regtest

* fix new tests with deprecated

* remove asserts

* comments

* new wallet p2pk tests

* getting there

* add more tests

* fixes

* refactor htlc and p2pk validation

* reduce code

* melt with sigall

* fix htlcs

* fix deprecated api tests

* Update cashu/mint/conditions.py

Co-authored-by: lollerfirst <43107113+lollerfirst@users.noreply.github.com>

* refactor sigall validation

---------

Co-authored-by: lollerfirst <43107113+lollerfirst@users.noreply.github.com>

cashu/mint/verification.py

@@ -75,7 +75,7 @@ class LedgerVerification(
         # Verify ecash signatures
         if not all([self._verify_proof_bdhke(p) for p in proofs]):
             raise InvalidProofsError()
-        # Verify input spending conditions
+        # Verify SIG_INPUTS spending conditions
         if not all([self._verify_input_spending_conditions(p) for p in proofs]):
             raise TransactionError("validation of input spending conditions failed.")
 
@@ -103,9 +103,8 @@ class LedgerVerification(
         ):
             raise TransactionError("input and output keysets have different units.")
 
-        # Verify output spending conditions
-        if outputs and not self._verify_output_spending_conditions(proofs, outputs):
-            raise TransactionError("validation of output spending conditions failed.")
+        # Verify SIG_ALL spending conditions
+        self._verify_input_output_spending_conditions(proofs, outputs)
 
     async def _verify_outputs(
         self,