allow for a txm event to have more levels of strictness

[kristinagalik]

teraz mame pre txm event attribut s nazvom strictness_type. zatial sa to lisi v tom, ako sa filtruju active_and_valid_donors_dict a active_and_valid_recipients_dict, a este v tom, na akej urovni sa vracaju ktore parsing issues v get_messages, no toto je len provizorne nakodene.

chcelo by to byt urobene tak, ze sa uroven parsing issues uz rovno bude odvijat od typu strictness_type, cize by get_messages nemali byt zmenene, ale txm event by mohol (priklad) mat nieco ako info o tom, kam patri aky typ parsing issue pre ktory strictness typ.

taktiez by to malo vyriesit to, aby sa tam dali lahko pridat nove urovne bez nejakej obskurnej zmeny v kode, a lahko dalo menit aj to, ze napr konkretny typ parsing issue bude zakazany napr aj v tom FORGIVING strictness type.