Remove dependency to QWidget / QMainWindow

This not GUI library!

include/com.h

@@ -3,7 +3,7 @@
 #ifndef SER_H
 #define SER_H
 #include <stdint.h>
-#include <QMainWindow>
+#include <QObject>
 #include <QString>
 #include <QTimer>
 #include <QSerialPort>
@@ -15,7 +15,7 @@
 // display all inputs and outputs in output window:
 //#define PRINTALLDEBUGS          1
 
-class T_com : public QMainWindow        //,  public QPlainTextEdit
+class T_com : public QObject        //,  public QPlainTextEdit
 {
     Q_OBJECT
 
@@ -45,7 +45,7 @@ private slots:
 
 
 public:
-    T_com(QWidget *parent = nullptr);
+    T_com(QObject *parent = nullptr);
     ~T_com();
 
     QTimer *serRecTime;

include/datIf.h

@@ -12,7 +12,7 @@
 #include "dcBL.h"
 
 
-#include <QMainWindow>
+#include <QObject>
 #include <QString>
 #include <QTimer>
 #include <QDebug>
@@ -278,7 +278,7 @@
 
 
 
-class T_datif : public QMainWindow
+class T_datif : public QObject
 {
     Q_OBJECT    
 
@@ -315,7 +315,7 @@ private slots:
     void StoredRecData();
 
 public:
-    T_datif(QWidget *parent = nullptr);
+    T_datif(QObject *parent = nullptr);
 
     T_prot *getProt() { return myDCIF; }
     T_prot const *getProt() const { return myDCIF; }

include/prot.h

@@ -3,7 +3,7 @@
 #define SERIAL_FRAME_H
 
 #include <stdint.h>
-#include <QMainWindow>
+#include <QObject>
 #include <QString>
 #include <QTimer>
 #include "tslib.h"
@@ -43,7 +43,7 @@
 #define     STARTSIGN_RECEIVE_LONG          0x5D
 
 
-class T_prot : public QMainWindow
+class T_prot : public QObject
 {
     Q_OBJECT