1.7.6 - Fix undead class exclusions

Replaced "is_dwarf" bool in unlocks.json with "race" key. Supports 3 options:

• "dwarf" - Drem or Dwarf, unlocks Stone Warden trees
• "undead" - Ghoul, Skeleton, or Whitehoof, blocks wilder / wild-gift trees
• "generic" or anything else - no restrictions

Initial Release - ToME 1.7.6

Initial release for game version 1.7.6. Supports Ashes of Urh'Rok, Embers of Rage, and Forbidden Cults DLC.

CPU and GPU search are supported. Binaries for Windows are provided; on another platform you can build it yourself :)