[Frontend] Settings for profile fields (#1885)

* get max emoji size from instance settings

* expose (hardcoded) max amount of profile fields in instance api

* basic profile field setting

* fix profile field hook structure for updates

* *twirls mustache* fix ze tests

---------

Co-authored-by: tsmethurst <tobi.smethurst@protonmail.com>

web/source/settings/lib/form/get-form-mutations.js

@@ -0,0 +1,47 @@
+/*
+	GoToSocial
+	Copyright (C) GoToSocial Authors admin@gotosocial.org
+	SPDX-License-Identifier: AGPL-3.0-or-later
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+"use strict";
+
+const syncpipe = require("syncpipe");
+
+module.exports = function getFormMutations(form, { changedOnly }) {
+	let updatedFields = [];
+	return {
+		updatedFields,
+		mutationData: syncpipe(form, [
+			(_) => Object.values(_),
+			(_) => _.map((field) => {
+				if (field.selectedValues != undefined) {
+					let selected = field.selectedValues();
+					if (!changedOnly || selected.length > 0) {
+						updatedFields.push(field);
+						return [field.name, selected];
+					}
+				} else if (!changedOnly || field.hasChanged()) {
+					updatedFields.push(field);
+					return [field.name, field.value];
+				}
+				return null;
+			}),
+			(_) => _.filter((value) => value != null),
+			(_) => Object.fromEntries(_)
+		])
+	};
+};