Fix: app freeze or crash when click close button

[Undefined-User]

Some apps will freeze or crash when click close button if we send willTerminateNotification. The developer documentation says this is a "may be called method", so it can be safely skipped.
https://developer.apple.com/documentation/uikit/uiapplicationdelegate/1623111-applicationwillterminate

Related PR: #136

[Undefined-User]

PR is ready for review, but I can't add reviewer myself. @TheMoonThatRises @JoseMoreville

[Undefined-User]

Now I try disable line_length check for apple document url, please review now~ @TheMoonThatRises @XuYicong

[TheMoonThatRises]

I'm not sure that this should be commented out, as the developer documentation states that it may be called to terminate applications already in the background. I think more investigation into this would be necessary.

[Undefined-User]

I'm not sure that this should be commented out, as the developer documentation states that it may be called to terminate applications already in the background. I think more investigation into this would be necessary.

@TheMoonThatRises I understand, you can feel free to test these IPA files and investigate the cause of the freeze or crash:

[IPA link1]: Install IPA and open it(maybe need disable keymapping), wait few seconds then click red close button in window, app will freeze and not responding now. No freezing status when using Cmd+Q key.

[IPA link2]: Install IPA and open it(maybe need disable keymapping), wait few seconds then click red close button in window, "App quit unexpectedly" crashing popup will show after few second. No crashing popup when using Cmd+Q key.

[Undefined-User]

I'm not sure that this should be commented out, as the developer documentation states that it may be called to terminate applications already in the background. I think more investigation into this would be necessary.

@TheMoonThatRises I understand, you can feel free to test these IPA files and investigate the cause of the freeze or crash:

[IPA link1]: Install IPA and open it(maybe need disable keymapping), wait few seconds then click red close button in window, app will freeze and not responding now. No freezing status when using Cmd+Q key.

[IPA link2]: Install IPA and open it(maybe need disable keymapping), wait few seconds then click red close button in window, "App quit unexpectedly" crashing popup will show after few second. No crashing popup when using Cmd+Q key.

@TheMoonThatRises Hi~ do you have any new ideas for this problem?