0.4.0a - "I Can Fix It" Edition

Wait, did he just push the second version number again? This update will break your saves, so yeah.
What initially was planned as a minor 0.3.1a release has grown into something bigger.
I'm experimenting with increasing items interactivity. Thus, the most new things are centered about that.
Some of the new thingies are yet to be balanced properly. E.g. I'm sure the new affixes still have to be buffed (the question is, how much?)
I hope you'll enjoy the changes.

New things:

• Added a new consumable item: Tome of Change. The name is not final, as it sounds bland. This very rare item allows you to reroll a random bad affix on any affixable item. Look at the affixable item you want to change, use the tome, and use it again for confirmation. If you're looking at no affixable item, the tome will try to change the weapon in your hands (because Doomguy is looking at it, huh). The new affix may be good or bad, the only guaranteed thing is that the new affix will be different from the old one. You can carry only one tome at a time, so don't hesitate to use it.
• Added prefixes that change your stats. They are applicable to any affixable item, so even flasks may now give you +10 to rare find.
• Added several more weapon suffixes. Part of them are self-improvement affixes, like the ones with armor. Weapon self improvement affixes give it stats upgrades when you kill legendary or mythic enemies with it.
• Self improving affixes are shown in stats pop-up as lines with altering text (the affix itself and its progress).

Fixes and balance changes:

• Doomguy won't grunt when damaged by his own armor anymore.
• Railgun buffed: lowered base ammo consumption (15 -> 10) and increased base min damage (65 -> 75). Base clip size lowered (45 -> 30), but this still means 3 shots from a single clip.
• BFG2704 buffed: +5/+15 base damage.
• Damage increase/reduction armor stats and affixes reworked. They may now have fractional values. Moreover, they both are weaker now, as they were the best/worst armor affixes in the game by a margin.
• Some bad affixes are weakened.
• Ammo consumption affixes now can be applied not only to BFG, but to any weapon which uses multiple ammo per shot (save the SSG).
• Fixed clip size affixes giving you +0 or -0 clip size.
• Multi-suffix item probabilities lowered.
• Fixed rare item generation crashes.
• Poison weapon affix buffed (increased damage potential).
• Status effect giving flask affixes are buffed (increased both min and max possible status time).
• Small flask nerfed (base consumption +5, base total heal 120 -> 100).

Internal changes:

• Stat system reworked to allow stat altering affixes.
• Added universal affix class (applicable to any artifacts).

Known bugs:

• Aforementioned internal changes may lead to bugs I didn't think about.
• You may find weapons whose clip sizes aren't divisible with their ammo consumption.
• You still can encounter items with some conflicting affix combination which doesn't make sense. Please report such occurences, but only if they are not fun.