Implement Combat logic to account for Armor and Resistance values

[SlappedWithSilence]

Damage is dealt directly. Improve Combat's damage logic to account for target Armor and Resistance.

• Armor is a flat value that must be integrated into the damage calculation
• Resistances are % values and can be applied last.

Proposed damage formula:

Final Damage Value = (Ability_Damage - (Armor * 0.1) * MAX((1.0 - SUM(TAG_RESIST_ARR[])), 0)

• Armor provides a flat damage reduction equal to 10% of the armor value
• All valid resistance tags are summed, and the final damage value is reduced by the a percentage equal to the sum. For example, two valid tags of a: 0.1 and b: 0.2 would provide a reduction of 0.3 and the final damage value would be multiplied by 0.7.

Alternatively, overlapping resistances can be multiplied against eachother to provide a diminishing-return.

Consider the following pseudo-code:

resistances: list = [0.1, 0.3, 0.2]
sort(resistances, descending=True)
res = resistances[0]

for resistance in resistances:
     if index == 0:
        continue
     res = res * (1 + resistance)

Starting with the largest resistance, cumulatively scale it up by each other resistance in descending order. This allows the engine to avoid trivially giving Entities 100% resistance to an Ability when the player equips multiple Effects each providing large resistance values (for example, 3 pieces of equipment each providing 35% resistance to different tags, each of which is applied to the attacker's Ability).