DCL Land Manager

This dApp provides the following functions.

Generate Coordinates: generates the json for the parcel coordinates for a rectangular Decentraland scene, for use in scene.json. When inserting this into "parcels" value array in the scene.json, check that the "base" parcel is one from the list.
Generate LandIds: create the list of LandIDs needed in the setManyLandUpdateOperator call for assigning a tenant's wallet to operate a district scene.