Scripts hang if application is not closed

Description of Issue

When a python script starts or attaches to an application, without closing it later (e.g. with a fixture), it will never terminate.

The python interpreter runs waiting for a thread to be terminated.

If the script runs in release mode (without a debugger) the application will be locked, making it unresponsive and you have to kill it with a task manager or similar tool

Affected version(s)

1.0.0 (all?)

System information

• OS: all
• OS version: all
• Qt version: all
• Python version: all

Steps to reproduce

Run this script:

```python

import qat

qat.start_application(<any registered app>)

```

What is the current issue behavior?

The script never terminates unless qat.close_application() is called.

What is the expected behavior?

The script should terminate and the application should be closed automatically.

If qat.attach_to_application() was used, the script should terminate but the application should not be closed (attaching should not take ownership of the app).

Relevant logs and/or screenshots

Possible fixes

Make sure the thread of the TCP server is terminated, using asynchronous socket or other mechanism.

Can leverage the atexit module to detect script termination.

Also a qat.detach() function could be useful to let a started application run after the script is terminated.