Store relative mutated item values instead of absolute

[DarkFenX]

Today CCP deployed expansion which changed ADC active ability duration. With it, durations of rolled ADCs changed as well.

However, they did not change in pyfa, as they are stored as absolute value. We should change it to be relative to fix that, but there are several ways:

• store multiplier of modified value/base value
• store unified "roll value" in range of [0, 1]
• store "good/bad" bit and roll value within good/bad range

They should behave the same way if base value of item changes in some EVE update, and differently if mutaplasmid roll range is changed.

[DarkFenX]

for example, ADC with duration of 100, unstable mutaplasmid -15%..+35%, rolled value of 120.

1. the value is stored as 120 / 100 = 1.2
2. the value stored is (15 + (120 / 100 - 1) * 100) / (15 + 35) = 0.7
3. stored as positive flag, (120 / 100 - 1) * 100 / 35 = 0.5714

If base duration is nerfed to 50, they will change modified value to:

1. 50*1.2 = 60
2. ((0.7 * (15 + 35) - 15) / 100 + 1) * 50 = 60
3. (0.5714 * 35 / 100 + 1) * 50 = 60

So they all work the same when base value is changed. However they work very different if mutation range changes, say, from -15%..+35% to +15%..+115%, with base value being 100:

1. 100 * 1.2 = 120
2. ((0.7 * (115 − 15) + 15) / 100 + 1) * 100 = 185
3. fucked up in my last formula but in this conversion result should be 115 + 0.5714 * 100 = 172.14

[DarkFenX]

CCP Larrikin found the dev who did this part, CCP Signal, and CCP Signal explained that values are stored on scale of [0..1] (with 0 being min of mutaplasmid modification range and 1 being max of mutaplasmid modification range). That's how we will have to reimplement it too.