Adds account mapping utilities and updates dependencies

Introduces utility methods to map IBANs to account IDs and retrieve accounts by IBAN for better account management. Updates PHPStan and PHP CS Fixer dependencies to newer versions. Enhances Makefile with a token refresh command. Removes redundant code in various classes for improved readability.

release 0.7.1 beta phase

require current ease-core

transactions response update

library now return accounts listing

almost working ?!?

code reformat

documentation added to git