Fix typo in action speed tooltip (performa -> perform) and update block tooltip to reflect current behavior.

Restrict "shield" subtype to effects that are affected by aegis, getShieldAmount, getShieldDuration, etc.

Makes combat tables for items refer back to their source item.

Adds a `self` property to `o.combat` and `o.special_combat` that refers back to item's full table. Combat tables tend to get passed around through various functions and callbacks and it can be difficult to connect a combat table to a full object. This makes the link two-way (`o.combat.self == o`).

This doesn't break saves, but any functionality dependent on the link *will* require a new save, as it only applies to newly generated items.

See merge request !693

Typo fix Gravitic Trap: damgae -> damage



See merge request !745

Typo fix Call of the Mausoleum: lyring -> lying



See merge request !746

Fix typo in action speed tooltip and update block tooltip

Fix typo in action speed tooltip (performa -> perform) and update block tooltip to reflect current behavior.

See merge request !751

Update Weapon of Light description to include the shield duration refresh.



See merge request !752

Shield effect subtype consolidation

1. Limit "shield" effect subtype to effects with a limited damage absorption amount (magical shields affected by getShieldAmount() etc, Psi Damage Shield, and Resonance Shield). Removed subtype from many effects that are not impacted by getShieldAmount, getShieldDuration, or that grant other types of protection, such as damage redirection, damage negation, negative life, and so on.
2. Clarify that only one shield is removed and chosen at random for Shattering Blow, Sunder Armour and Impale.

See merge request !754

Prevent Heroism lost life bonus from chaining infinitely.



See merge request !757