v: Fix item and class feature data to match 2014 (SRD 5.1) rules

itempack (120 files):
- Restore lost bonus-damage activities from 2014 values (Dragon Slayer 3d6,
  Holy Avenger 2d10 radiant, Vorpal 6d8, Flame Tongue 2d6, Life Stealing 3d6,
  Wounding 1d4, Oathbow 3d6, Maces, Sharpness 4d6, Slaying ammo 6d10, etc.)
- Restore replaced cast activities from 2014 (41 items: elemental rings,
  staffs, wands, crystal balls, helms, necklaces, etc.)
- Fix recovery periods (dawn/lr per 2014) and restore missing item
  properties (foc, weightlessContents, stealthDisadvantage)

class-abilityphb (25 files):
- Restore lost damage activities (Improved Divine Smite, Colossus Slayer,
  Empowered Evocation, Overchannel, Foe Slayer, Hurl Through Hell,
  Holy Nimbus, Divine Strike x3, Deflect Missiles, Quivering Palm)
- Fix recovery (Second Wind, Ki) and uses scaling (Wild Shape, Font of Magic)

Note: Dragon Slayer uses 3d6 per its documented rule (system 2014 data
erroneously says 2d10); horns of valhalla and manual of golems left as-is.