Foundry 13: Call and merge in underlying _prepareContext data

[kgar]

Foundry 13 Testing 1 shows this context data. Update Tidy's document sheets (Item, Actor) to leverage this, and ensure their types are accounted for.

  /** @inheritDoc */
  async _prepareContext(options) {
    const context = await super._prepareContext(options);
    const document = this.document;
    return Object.assign(context, {
      document,
      source: document._source,
      fields: document.schema.fields,
      editable: this.isEditable,
      user: game.user,
      rootId: document.collection?.has(document.id) ? this.id : foundry.utils.randomID()
    });
  }