feat/message handling

• feat: process messages according to PSR-3
• feat: include consistent uid across one request
• feat: use consistent WordPress timezone for log statements
• feat: always use WC logger if available
• feat: use WordPress log as fallback
• refactor: deprecate use of Settings class
• feat: integrate FingersCrossedHandler

assigned to @grola

requested review from @marcinkolanko

approved this merge request

assigned to @bjaskulski and unassigned @grola

merged