Game data: refactor settings

Update game settings architecture:

• Allow item settings to incorporate all other details beyond priority e.g.: thresholds, Super Metroid - in most cases, 2x Power Bombs are "high", some number more "medium", rest "low"
• Allow default groups e.g.: Super Metroid "flight" - either Space Jump or Bomb
• Convert trap settings to normal item settings w/ badge and custom priority

See #31 for the natural extension - support applying presets.