Build issues to address with Druid / 0.4 release

Hello all! Since Druid was confirmed to be added in 0.4 there are several remaining build issues to be addressed to make both its elemental caster / shapeshifting and hybrid builds viable and keep them synergizing with other classes.

Elemental casting builds issues (including caster Druids):
- Lack scaling from gear as there are no elemental damage mods, no good analogues to added X damage of Y element to attacks and likewise. These should be added to provide proper gear scaling for elemental spell builds.
- Lack synergy since elemental Sorcereress spells got infusions slapped on them that don't synergize with any other class, so for example Druid wishing to borrow some Sorceress skills would need to deal with infusions that don't scale his Druid spells (making that scaling limited) and vice versa. To solve that consider either providing synergies between elemental infusions and non-Sorceress elemental spells or just removing elemental infusions and changing their generation and empowerment effects to be Power Charge based (generating and spending Power Charges to trigger empowered effects of spells) as that would have much more synergy with other classes and other existing systems.
- Mana cost issues should be addressed too since unlike elemental attack builds casters don't have access to powerful offensive mana restoration tools like Walker of the Wilds node. Some spells could use another cost reduction or mana leech could be allowed in some form for spell builds too (for example that could be a keystone that would reduce mana regeneration, but allow spells to benefit from mana leech too).

Melee builds issues (including shapeshifting Druids):
- Need some form of additional mitigation to compensate for necessity to stay in melee and eat all the hits and crowd control effects that ranged can avoid by just kiting and dodging.
- Life needs a buff to be competitive enough with Energy Shield as a scaling defensive system.
- Armor could use a way to better mitigate Chaos damage and not be as vulnerable to it as it is currently in 0.3.

Hybrid builds issues (including Druids):
- Lack proper scaling with gear as well - there are little to no hybrid boosting modifiers on items like skill speed, all damage, + X to all (elemental) skills and likewise. These should be added to provide proper scaling for hybrid builds and can have lower values than specialized affixes (attack speed / fire damage / + X to all melee skills and likewise) to compensate for increased versatility.
- Lack effects that allow scaling of both attacks and spells. Crown of Eyes exists, but it is undertuned, has bad item affixes, does not affect attack and cast speed and likewise. It should be boosted to affect both spell / attack damage and cast / attack speed and get better item mods and there should be more items that allow to enable proper scaling for hybrid builds.