Added /Claim command
Useage: Players can claim upto N planets (N is defined by PlayerData.MaxClaims. Currently one but easily modifiyable by role

When a planet is claimed only that player and any players on the players whitelist are allowed to build/modify.
Not being on a players blacklist does not allow the player to build on a claimed planet.

/Claim: Claim a planet. Fails if the planet is the spawnplanet, already claimed, the claimer has no build permission for the planet, the claimer has already staked their maximum number of claims.

/Claim release: Release claim[0] (Claim[1] becomes claim[0], so on so forth. Fails if player has no claims staked
/Claim release #: Release claim[#], fails if player does not have # claims staked

/Claim warp: Warp to planet claimed at #. Fails if the player is not on their ship, fails if player has not claimed any planets.
/Claim warp #: Warp to claimed planet #. Fails if the player is not on their ship, fails if player has not claimed # planets.

/Claim list: Lists all planets claimed by player.