refactoring command received handler in order to re-use when confirmation has been given
removing reaction from showSuggestion and remind command
adding log message for message deleted message, in case the member left
all commands from now on must work without the member field from the message, as this is not available when retrieving the message
moving invite filter to separate module
updating to newer liquibase version
changing concept of immune roles which are directly associated to commands to immune roles which are immune against certain effects. these effects can be configured directly by the command (and a condition checks this effect), but they can be used in services as well, unrelated to commands
adding checks to not execute message received listeners for the wrong message types
adding metric support for 502 status
fixing duplicating help entries when two module definitions with the same key are present
