Fix memleaks found with AddressSanitizer/LeakSanitizer

Fixes:
Direct leak of 16 byte(s) in 1 object(s) allocated from:
    #0 0x7efeb72f46b8 in operator new(unsigned long) ../../../../src/libsanitizer/asan/asan_new_delete.cpp:95
    f4exb#1 0x7efe834b65a2 in WebServer::WebServer(unsigned short&, QObject*) sdrangel/plugins/feature/map/webserver.cpp:34
    f4exb#2 0x7efe834bc342 in MapGUI::MapGUI(PluginAPI*, FeatureUISet*, Feature*, QWidget*) sdrangel/plugins/feature/map/mapgui.cpp:265
    f4exb#3 0x7efe835372f4 in MapGUI::create(PluginAPI*, FeatureUISet*, Feature*) sdrangel/plugins/feature/map/mapgui.cpp:66
    f4exb#4 0x7efe834b5471 in MapPlugin::createFeatureGUI(FeatureUISet*, Feature*) const sdrangel/plugins/feature/map/mapplugin.cpp:72
    f4exb#5 0x7efeb6b416c2 in FeatureUISet::loadFeatureSetSettings(FeatureSetPreset const*, PluginAPI*, WebAPIAdapterInterface*, QList<Workspace*>*, Workspace*) sdrangel/sdrgui/feature/featureuiset.cpp:185
    f4exb#6 0x7efeb67e9b41 in MainWindow::loadConfiguration(Configuration const*, bool) sdrangel/sdrgui/mainwindow.cpp:1503
    f4exb#7 0x7efeb6730e3e in MainWindow::MainWindow(qtwebapp::LoggerWithFile*, MainParser const&, QWidget*) sdrangel/sdrgui/mainwindow.cpp:257
    f4exb#8 0x557281218bad in runQtApplication sdrangel/app/main.cpp:196
    f4exb#9 0x5572812194a3 in main sdrangel/app/main.cpp:248
    f4exb#10 0x7efeb10456c9 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

and others

plugins/feature/map/webserver.cpp

@@ -15,6 +15,7 @@
 // along with this program. If not, see <http://www.gnu.org/licenses/>.          //
 ///////////////////////////////////////////////////////////////////////////////////
 
+#include <QtAlgorithms>
 #include <QResource>
 #include <QFile>
 #include <QRegularExpression>
@@ -41,6 +42,11 @@ WebServer::WebServer(quint16 &port, QObject* parent) :
     m_mimeTypes.insert(".geojson", new MimeType("application/geo+json"));
 }
 
+WebServer::~WebServer()
+{
+    qDeleteAll(m_mimeTypes);
+}
+
 void WebServer::incomingConnection(qintptr socket)
 {
     QTcpSocket* s = new QTcpSocket(this);

plugins/feature/map/webserver.h

@@ -64,6 +64,7 @@ class WebServer : public QTcpServer
 
 public:
     WebServer(quint16 &port, QObject* parent = 0);
+    ~WebServer();
     void incomingConnection(qintptr socket) override;
     void addPathSubstitution(const QString &from, const QString &to);
     void addSubstitution(QString path, QString from, QString to);