InteractionTarget network rpc doesn't validate x and z parameters

This is something that got introduced with the last beta update, the addition of x and z here. It's not in the live branch.

	InteractionTarget = function(player, action, target, x, z)
		if not (optnumber(action) and
				optentity(target))
		then
			printinvalid("InteractionTarget", player)
			return
		end
		local playercontroller = player.components.playercontroller
		if playercontroller then
            local pos
			if x then
				-- local x1, z1 = ConvertPlatformRelativePositionToAbsolutePosition(x, z, platform, platform_relative)
				if not IsPointInRange(player, x, z) then
					print("Interaction Target out of range")
					return
                else
                    pos = Vector3(x, 0, z)
				end
			end
			playercontroller:OnRemoteInteractionTarget(action, target, pos)
		end
	end,

x and z could be something other than a number, and easily crash the server.