Add tests for gui.

[tov101]

Changes:

File: src/asammdf/gui/utils.py

• self.qfinished.connect(lambda: QtCore.QCoreApplication.processEvents())
  • after progress dialog is closed or cancelled, distroy function didn't get the chance to do the job.
• class ProgressDialog inherits QtWidgets.QProgressDialog which inherits PySide6.QtWidgets.QDialog
  • QDialog has own class variable finished which emits an int.
  • class variable finished of ProgressDialog was refactored in order to avoid being overwritten by the on of QDialog.

Reason: TypeError was raised because of this during tests developments and manual usage.

Error: <class 'TypeError'>	 
finished(int) needs 1 argument(s), 0 given!

Details: 2023-04-24, 12:29:07
--------------------------------------------------------------------------------
<class 'TypeError'>	 
finished(int) needs 1 argument(s), 0 given!
--------------------------------------------------------------------------------
  File "D:\gh\asammdf\src\asammdf\gui\utils.py", line 312, in thread_complete
    self.finished.emit()

File: src/asammdf/gui/batch.py

• Run black and isort in order to get style checks passed.

File: src\asammdf\gui\widgets\tree.py

524: DeprecationWarning: 'exec_' will be removed in the future. Use 'exec' instead.

File: src\asammdf\gui\widgets\plot.py

5696: RuntimeWarning: overflow encountered in scalar subtract

[tov101]

Green again.. but I'm not ok with that segmentation fault anymore.