Add FAQ and support buttons to settings.

Telegram/SourceFiles/apiwrap.cpp

@@ -4776,6 +4776,23 @@ FileLoadTo ApiWrap::fileLoadTaskOptions(const SendOptions &options) const {
 		options.replyTo);
 }
 
+void ApiWrap::requestSupportContact(FnMut<void(const MTPUser &)> callback) {
+	_supportContactCallbacks.push_back(std::move(callback));
+	if (_supportContactCallbacks.size() > 1) {
+		return;
+	}
+	request(MTPhelp_GetSupport(
+	)).done([=](const MTPhelp_Support &result) {
+		result.match([&](const MTPDhelp_support &data) {
+			for (auto &handler : base::take(_supportContactCallbacks)) {
+				handler(data.vuser);
+			}
+		});
+	}).fail([=](const RPCError &error) {
+		_supportContactCallbacks.clear();
+	}).send();
+}
+
 void ApiWrap::readServerHistory(not_null<History*> history) {
 	if (history->unreadCount()) {
 		readServerHistoryForce(history);