Rework armor and shield systems

[darozak]

I need to rework the armor and shield systems as follows:

• Armor and shields provide defense against kinetic, thermal, electrical, and radiation damage.
• Armor offers ablative resistance to damage. In other words, each hit reduces the ability of the armor to protect against that type of damage.
• Shields offer absorptive resistance to damage. They remove the same amount of damage every attack but do so at a power cost.
• Any damage that gets through a robot's shields and armor will kill it.
• Remove HPs since this will be covered by armor.
• Remove maxHPs since there is no healing.

[darozak]

I should generalize the damage and resistance types by simply using arrays for each. Each element of the array will be assigned to a different damage type. For example:
0 = Kinetic
1 = Thermal
2 = Electro Magnetic
3 = Radiological

[darozak]

Reworked so that it separately tracks different types of damage and defensive systems as described above (48ae353).