create improved server/client commandline launching method

launch.py

@@ -1,8 +1,17 @@
-from PyQt5.QtWidgets import QApplication
-from client.gui import MainWindow
+import sys
 
-app = QApplication([])
-app.setApplicationName("TCPChat Client")
-m = MainWindow()
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        print('Please provide one argument besides the file describing whether to launch the client or server.')
+        print('Client/C/1 to launch the client. Server/S/2 to launch the server.')
+    else:
+        if str(sys.argv[1]).lower() in ['client', 'c', '1']:
+            from PyQt5.QtWidgets import QApplication
+            from client.gui import MainWindow
 
-app.exec_()
+            app = QApplication([])
+            app.setApplicationName("TCPChat Client")
+            m = MainWindow()
+            app.exec_()
+        elif str(sys.argv[1]).lower() == ['server', 's', '2']:
+            from server import main