[#83211730] Fixing error with response decoding, moving team check to the template webhook for the benefit of all webhooks.
[#83211730] Adding check to create an event upon an event update webhook to fix issues with adding groups to events after an event was created.
[#83211730] Adding webhook cancellation check before each TeamSnap webhooks core functionality.
[#83211730] Adding inital check to determine if the event was already created by another webhook, fixes issues with duplicate events on each team for a game event.
[#83211730] Addressing PR comments.

[#83211730] Addressing PR comment for un-used use statement.

[#83211730] Removing outdated comment.
Merge pull request #6 from AllPlayers/83211730-webhook_event_fix

[#83211730] Fixing TeamSnap event webhooks.
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