it would be good to have
min-width, max-width <-- this 2 is good for PWA, if user resized it too small, it would become ugly.
maximized <-- this would be maximized on first load.

another thing would be, try delay webview resize when the host window resize, like how all the browser did, this would make sure PWA reflective size won't response immediately... current resize is seriously lagging

Describe your environment

• Operating system: Linux
• Python Version: 3.8.6
• CCXT version:1.40.99
• Freqtrade Version: 2021.1

Describe the enhancement

Add ping support to the rest_client.py script.

I'm using the rest_client.py script to monitor my freqtrade bot using a custom shell+python script, and it looks like I cannot use the ping command to verify that