Add missing includes in some header files

See https://github.com/Martchus/syncthingtray/issues/64

connector/syncthingconnection.h

@@ -12,6 +12,7 @@
 #include <QSslError>
 #include <QTimer>
 
+#include <cstdint>
 #include <functional>
 #include <limits>
 #include <vector>

connector/syncthingconnectionsettings.h

@@ -4,6 +4,7 @@
 #include "./global.h"
 
 #include <QByteArray>
+#include <QList>
 #include <QSslError>
 #include <QString>
 

connector/syncthingdev.h

@@ -10,6 +10,10 @@
 #include <QString>
 #include <QStringList>
 
+#include <cstdlib>
+#include <unordered_map>
+#include <vector>
+
 namespace Data {
 
 /// \brief The SyncthingDevStatus enum represents a Syncthing device status.

connector/syncthingdir.h

@@ -11,6 +11,9 @@
 #include <QMetaType>
 #include <QString>
 
+#include <unordered_map>
+#include <vector>
+
 namespace Data {
 
 /// \brief The SyncthingDirStatus enum represents a Syncthing directory status.

connector/syncthingprocess.h

@@ -6,6 +6,7 @@
 #include <c++utilities/chrono/datetime.h>
 
 #include <QProcess>
+#include <QStringList>
 #include <QTimer>
 
 namespace Data {