shouldIncludeAddon(addon) {
    if (!this._addonEnabled(addon)) {
      return false;
    }

    return !this._addonDisabledByExclude(addon) && !this._addonDisabledByInclude(addon);
  }
Returns whether an addon should be added to the project

    @private
    @method shouldIncludeAddon
    @param {Addon} addon
    @return {Boolean}