Increase power requirements for gates

Gates now require 100% more energy to gate between worlds. (Factor: 8x)
Gates now require 50% more energy to gate between locations on the same world. (Factor: 1.5x)
Naquadah will now open the gate once per item, down from 24.
Naquadah will now hold a wormhole open for no more than 1 minute, down from 80.
Gates now stay open for a maximum time of 3.8 minutes (228 seconds)
Active stargates now will load all chunks in a 2x2 radius, (16 chunks total). Players need to make sure any active defenses (such as forcefields) only exist in these chunks.