MBGStats BGStats PvP Battleground Statistics

addition to partitions update -- adding arena and battleground filter buttons in the UI

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partitions update.

Adds partitions functionality; access these via /mbg and using the instances toggle or partitions buttons
-instances can be assigned to named partition

-partitions can be analyzed as a set of data together

-partitions can be used to inactivate data within a partition from the all data view

instances can now be deleted from the ui instance data view

/mbg brag

still a command. no changes, but still awesome.