NEW YORK — A trio of half-brothers who were wrongfully convicted of murder received a $17 million settlement from the city. The family of a mentally ill former Marine who died in a hot jail cell was awarded $2.25 million. And a man who spent 23 years behind bars before he was exonerated was given $6.5 million. All of those recent settlements were unusual because they were made before any lawsuit had ever been filed, part of an aggressive push by New York City Comptroller Scott Stringer to quickly dispense with …