----- conflicts.json example -----
If a player has learned modid:spell1, then modid:spell2 and modid:spell3 are blocked from being learned.
However, if a player has learned modid:spell2 or modid:spell3, then modid:spell1 is blocked from being learned.
{
  "spells": {
    "modid:spell1": [
      "modid:spell2",
      "modid:spell3"
    ],
    "modid:senbonzakura_kageyoshi": [
      "modid:hihio_zabimaru"
    ]
  }
}