Add opt-in KSwitcher LAN discovery and mutual code pairing preview

src/config_main.cpp

@@ -112,6 +112,7 @@ void App::reloadLayouts()
 }
 void App::clearHistory() { request(*this, ConfigClearHistory); }
 Bytes App::syncConflictData() { return request(*this, ConfigSyncConflicts); }
+Bytes App::lanCommand(const Bytes &bytes) { return request(*this, ConfigLan, bytes); }
 std::wstring App::syncCommand(int action, const std::vector<SyncChoice> &choices)
 {
     auto result = action == 4 ? request(*this, ConfigSyncResolve, encodeSyncChoices(choices)) :