Read extra GBFS feeds from a file

This replace the hardcoded special case in code, and it checks wheather
those feeds have meanwhile been added to the NABSA database so we don't
need to maintain duplicates.

src/tools/gbfs-feeds.txt

+https://api.openbike.ulm.dev/gbfs/gbfs.json
+https://mds.bird.co/gbfs/v2/public/ulm/gbfs.json
+https://mds.bird.co/gbfs/chicago/gbfs.json
+https://www.bolt.miami/bolt2/chi/gbfs/gbfs.json
+https://portal.clevrmobility.com/api/gbfs/chicago/en/discovery/?format=json
+https://gbfs.uber.com/v1/chicago/gbfs.json
+https://web.spin.pm/api/gbfs/v1/chicago/gbfs.json
+https://chicago-gbfs.getwheelsapp.com/gbfs.json
+https://share.veoride.com/api/share/gbfs.json
+https://cykel.jenarad.de/gbfs/gbfs.json
+https://ixsi.swu.de/gbfs.json
+https://gbfs.conficars.de/gbfs.json

src/tools/gbfs-feeds.txt.license

+SPDX-License-Identifier: CC0-1.0
+SPDX-FileCopyrightText: Volker Krause <vkrause@kde.org>

src/tools/gbfsprobe.cpp

@@ -36,10 +36,7 @@ public:
     void writeFeeds();
 
     QNetworkAccessManager m_nam;
-    // extra feeds not in systems.csv
-    QStringList m_gbfsFeeds = {
-        QStringLiteral("https://api.openbike.ulm.dev/gbfs/gbfs.json"),
-    };
+    QStringList m_gbfsFeeds;
     int m_currentFeedIdx = -1;
 
     std::vector<GBFSService> m_services;
@@ -81,6 +78,28 @@ void GBFSProbe::getFeedList()
 
         std::sort(m_gbfsFeeds.begin(), m_gbfsFeeds.end());
         m_gbfsFeeds.erase(std::unique(m_gbfsFeeds.begin(), m_gbfsFeeds.end()), m_gbfsFeeds.end());
+
+        QFile extraFeeds(QStringLiteral("gbfs-feeds.txt"));
+        if (!extraFeeds.open(QFile::ReadOnly)) {
+            qCritical() << extraFeeds.errorString();
+            QCoreApplication::exit(1);
+            return;
+        }
+        const auto lines = QString::fromUtf8(extraFeeds.readAll()).split(QLatin1Char('\n'));
+        for (const auto &line : lines) {
+            const auto extraFeed = line.trimmed();
+            if (extraFeed.isEmpty()) {
+                continue;
+            }
+
+            const auto it = std::lower_bound(m_gbfsFeeds.begin(), m_gbfsFeeds.end(), extraFeed);
+            if (it != m_gbfsFeeds.end() && (*it) == extraFeed) {
+                qDebug() << "Extra feed already in NABSA systems.csv:" << extraFeed;
+                continue;
+            }
+            m_gbfsFeeds.insert(it, extraFeed);
+        }
+
         qDebug() << "Found" << m_gbfsFeeds.size() << "possible feeds - running discovery on them...";
         discoverNextFeed();
     });