Regular expressions might not match API object identifiers

[whyscream]

Related to: https://github.com/mollie/magento2/issues/669

In the linked issue, order identifiers (ord_* ) with a 'new' syntax turned up in production environments, while code was not ready to handle them.

Some parts of the Python client use regular expressions to extract object identifiers (customer and settlement IDs) from URLs, these regular expressions have the same issue as the Magento module. The problem is not that big, since:

• They don't interfere with regular transactions, only nested objects
• There hasn't been any mention of Customer (cst_*) and Settlement (stl_*) IDs occurring with this syntax yet

[whyscream]

Closing this, we refactored all regular expressions that would break the new forma, for all Mollie object identifiers.

[whyscream]

Resolved in https://github.com/mollie/mollie-api-python/releases/tag/3.6.0