Add fees (#503)

* wip

* wip

* model

* refactor wallet transactions

* refactor wallet

* sending with fees works and outputs fill up the wallet

* wip work

* ok

* comments

* receive with amount=0

* correctly import postmeltrequest

* fix melt amount

* tests working

* remove mint_loaded decorator in deprecated wallet api

* wallet works with units

* refactor: melt_quote

* fix fees

* add file

* fees for melt inputs

* set default input fee for internal quotes to 0

* fix coinselect

* coin selection working

* yo

* fix all tests

* clean up

* last commit added fees for inputs for melt transactions - this commit adds a blanace too low exception

* fix fee return and melt quote max allowed amount check during creation of melt quote

* clean up code

* add tests for fees

* add melt tests

* update wallet fee information

tests/conftest.py

@@ -45,6 +45,7 @@ settings.mint_private_key = "TEST_PRIVATE_KEY"
 settings.mint_seed_decryption_key = ""
 settings.mint_max_balance = 0
 settings.mint_lnd_enable_mpp = True
+settings.mint_input_fee_ppk = 0
 
 assert "test" in settings.cashu_dir
 shutil.rmtree(settings.cashu_dir, ignore_errors=True)