All MegaPack units start with full HP and EP

This differs in two ways:

1. Units that have upgrades that boost health take effect from that upgrade immediately, instead of having to regenerate the difference.
2. Units with EP start with full EP instead of none. Thus, a newly created mage can head straight into battle instead of having to wait for their EP to regenerate. This may impact balance. On one hand, EP using units were at a disadvantage because of this need to wait. On the other hand, this makes them slightly more potent, off the bat. It shouldn't make a difference when attacking, though, and only a minor difference for defenders.