Shield tweaking

[Xenosaga]

In order to really create diversity in shielding and to make people think about who they will fight, I suppose the following:

- Increase the damage amplification/reduction of shields to 1.4 from 1.2
- Make pulses neutral, so they always deal normal damage
- Give different Codename guns different weapon types (Particle, Laser etc.)
- Give Capship turrets a weapon type

Because, as of now, Graviton shields are almost always the best choice, followed by Molecular. Positron shields are barely viable, because of their weakness to Pulses.