Summing of effects that should not reach 100%/1.0 values with diminishing returns formula

[FominArtmind]

Motivation: there are several effects that on reaching 100%/1.0 or above value are leading to incorrect behavior.
What actually done:

1. for the following effects
   MagicEffectType.AddPhysicalResistancePercentage,
   MagicEffectType.AddBluntResistancePercentage,
   MagicEffectType.AddSlashingResistancePercentage,
   MagicEffectType.AddPiercingResistancePercentage,
   MagicEffectType.AddChoppingResistancePercentage,
   MagicEffectType.AddFireResistancePercentage,
   MagicEffectType.AddFrostResistancePercentage,
   MagicEffectType.AddLightningResistancePercentage,
   MagicEffectType.AddPoisonResistancePercentage,
   MagicEffectType.AddSpiritResistancePercentage,
   MagicEffectType.AddElementalResistancePercentage,
   MagicEffectType.AvoidDamageTaken,
   MagicEffectType.AvoidDamageTakenLowHealth,
   MagicEffectType.ModifyAttackStaminaUse,
   MagicEffectType.ModifyBlockStaminaUse,
   MagicEffectType.ModifyJumpStaminaUse,
   MagicEffectType.ModifySprintStaminaUse,
   MagicEffectType.Slow
   the formula of their summing from different items changed. Each item value is capped at 0.9, then values are ordered from the max one to min one. Max is taken as sum, remaining ones applied as sum = sum + (1.0 - sum) * effect. For example, two effects with values 0.9 and 0.9 will sum not as 1.8 but as 0.9 + 0.1 * 0.9 = 0.99. Other example: effects with values 0.1 and 0.1 will sum not as 0.2 but as 0.1 + 0.9 * 0.1 = 0.19.
2. Fixed ReduceWeight effect could reach values > 1.0.
3. Updated visual hint for the effect total value.

Backward compatibility: affects all users, theoretically can change the experience of the users using custom items or effects achieving elemental immunity etc. However, for the ones using default values in configuration files (that are in general very low in comparison with threshold of 0.9), changes are minor.

[FominArtmind]

I'm trying to understand bugs happening with ModifyAttackSpeed effect, sometimes attack speed becomes very high and value change itself doesn't look consistent even without taking that into accont.
During the process I've found that I need to do some additional reworks related to this PR taking into account how "LowHealth" modifiers are applied.

[FominArtmind]

Added fix for AvoidDamageTaken and AvoidDamageTakenLowHealth interaction, looks as the feature is set now.