Add players replicant schema and dashboard CRUD (#5)

* Add players replicant and dashboard CRUD

* Fix players table typing

src/extension/util/replicants.ts

@@ -17,3 +17,4 @@ function hasNoDefault<T>(name: string) {
  * and to make sure they have any correct settings on startup.
  */
 export const exampleReplicant = hasDefault<Schemas.ExampleReplicant>('exampleReplicant');
+export const playersReplicant = hasDefault<Schemas.Players>('players');