Afflicted+predator

Mindrot fix.  
Creeping Darkness hits target tile.  
Predator revision: https://imgur.com/a/Tv89YRZ

See merge request !558

Blighted Summoning Tweaks

- All summons get bone shield and more Spellpower.
- Summoner Summons and Necro Minions also get corrupted talents
- All other summons also get blight conversion and VD.
- is_nature_summon tag added for summoner summons.
- summon_count handled innately in actor.lua (bonus counts may still be added e.g. alch golem)

See merge request !553

1.6b anorithil

Cost Tweaks (mostly increases).  
Firebeam hits 3 times in a row, +10 base dam.  
shadow blast damage corrected.  
Corona bolts are slightly faster.  
Searing light aoe does not friendly fire.  
Searing light targeting updated to reflect aoe portion.  
Glyphs sustain has cd.  
Fixed Divine Glyphs.  
Pos and Neg regen base (removed from chants and hymns).  
Chants 4 gives pos when hit by weapon.  


See merge request !552

Fixes

ITEM_NATURE_REMOVE_FROM_TIME

See merge request !557

Talent Category point of level 36 moved to 34