The Albany Symphony dropped details of its 2018-2019 season on Wednesday evening, and the tally was five world premieres, six soloists, one guest conductor and a performance of Benjamin Britten's monumental "War Requiem" with Albany Pro Music at Proctors.Also coming: a memorial concert for Heinrich Medicus, the nuclear physicist and longtime Albany Symphony benefactor who died last February and left $7 million to the orchestra's endowment.