Add fallback stripping and C6 stripping
Converting banner definitions from pity vars to lerp arrays
Properly implement rates and pool smoothing
Also move reusable functions to Utils
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.
