Changes to the Posses and Posse Event!

We've gotten a lot of feedback from many of y'all cowboys about the posse feature and the posse event! After takin' a good look at the comments we've decided to do a few changes.
The following changes have been done:
- Y'all can only contribute points to the Posse in which y'all were when the Posse Event started
- Y'all can only claim rewards in the Posse in which y'all were when the Posse Event started
- If y'all have never joined a Posse before, y'all can join a Posse in the middle of the event, but y'all cannot contribute any points during that event! (NOTE: We will fix this so that new players are able to contribute points when they join their first posse)
The posse members who cannot participate in the on-going event will always be marked in the list of the contributors.
The following changes have been done:
- Y'all can only contribute points to the Posse in which y'all were when the Posse Event started
- Y'all can only claim rewards in the Posse in which y'all were when the Posse Event started
- If y'all have never joined a Posse before, y'all can join a Posse in the middle of the event, but y'all cannot contribute any points during that event! (NOTE: We will fix this so that new players are able to contribute points when they join their first posse)
The posse members who cannot participate in the on-going event will always be marked in the list of the contributors.
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