Add a new flag to support plugin Residence

[siulung201314]

Is it possible that flightcontrol support the residence plugin with a new flag "flight"? Therefore, players who has the flag of "flight is trusted to fly in the residece.

I have using another plugin called Quickshop. It can also work with residence plugin. Player needs to have a flag(quickshop-create) that is provided by Quickshop to create shop in the residence. I think that Flightcontrol can do this in the similar way.

The below is the code of Quickshop that how to have a flag to support Residence. https://github.com/PotatoCraft-Studio/QuickShop-Reremake/blob/master/src/main/java/org/maxgamer/quickshop/integration/residence/ResidenceIntegration.java