Teardown when Play Mode is stopped while the Autopilot running

[nowsprinting]

Problem

The AutopilotState asset still contained information that the autopilot was running, so it had to be reset.

Condition: When a user stops Play Mode while the Autopilot is running.

Fixes

Reset the AutopilotState when Play Mode is stopped while the Autopilot is running,
using EditorApplication.playModeStateChanged event.

This behavior was tested enable and disable domain reloading in Enter Play Mode Settings.

Minor fixes: Improved the exit process when launching from the commandline.

Priority

I hope to your review && merge around one week.
There is no need to release it yet.

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[bo40]

@nowsprinting
I tested this PR on my local machine using Unity Editor 2021.3.
When I start Anjin by the Run button inside Inspector window and then manually switch from Play Mode to Editor Mode, OnChangePlayModeState is not called, and the autopilot state is not reset.
Do you have any idea what might be causing this issue?

[nowsprinting]

@bo40 san, Sorry, maybe it does not work if domain reloading is enabled.
Could you please disable it and try again?
In Edit > Editor > Enter Play Mode Settings

I will add a warning to README.

[bo40]

@nowsprinting
After disabling the domain reloading setting, Anjin worked as expected. Thank you for your prompt reply!

[nowsprinting]

@bo40 san, I FIxed it.

• Same behavior if enabling domain reloading
• Improved the exit process when launching from the commandline.
• Left the troubleshooting section in the READMEs. Also added case the Run button on AutopilotSettings.

[bo40]

Thank you!
LGTM 👍