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Send mail command now works from console (to use it from console change the uuid in the 'SendMailCommand' file

Send mail command now works from console (to use it from console change the uuid in the 'SendMailCommand' file

Signed-off-by: Jaida Wu <mlgmxyysd@meowcat.org>

1. During the conversion of Morphia calls to the new API, some of the `Filter.eq()` calls had their `field` set to `playerId` due to a copy/paste typo.

2. Morphia 2 switches to the codec system, so anything that will be serialized in the pipeline requires the `@Entity` annotation.