CSRF in gadgets plugin

The affected methods are: AddOrRemoveGadgetSpecAction, doAdd AddOrRemoveGadgetSpecAction, doRemove AddOrRemoveGadgetFeedAction, doAddGadgetFeed AddOrRemoveGadgetFeedAction, doRemoveGadgetFeed WhitelistAdminAction, doAddWhitelistUrl WhitelistAdminAction, doRemoveWhitelistUrl RevokeOAuthTokensActio...