Removal is done by rewinding an object and replaying all other egos on
top of it. Not too fancy, but surefire.

It required some minor additions to the engine code, but nothing too brutal.
instant_resolve = "last" now runs last resolvers as well;
generic and genericlast resolvers now receive additional arguments
that are passed to resolvers.

- Removed the instakill and rank changes for higher difficulties to normalize the ruleset

example: sustain_slots = 'celestial_chant'
Changed most sustains to use the system.
Talent tooltips will show if they will deactivate anything.

Moved most of the gem color information for various talents into a table.
Now more amenable to adding new gem colors.
Tirakai's Maul can have gem interactions defined easier.
Goedalath Rock now gives golems shadowflame damage.
Shadowflame damage type now has a text color.
Gems show their 'latent damage type' on tooltips.