Investigate delete player by segment behavior

**Is your feature request related to a problem? Please describe.**
As discovered in PR #52 players are not reliably deleted from the segment.

**Describe the solution you'd like**
We need to investigate why this is happening and how we can make PlayFabBuddy behavior more dependable.

We should retry if a reasonable wait time is sufficient or let the players know after the command is executed that not all players might be deleted and that he needs take action.