Add an option to make scrcpy pause on exit.
Three behaviors are possible:
- always pause on exit:
--pause-on-exit
--pause-on-exit=true
- never pause on exit:
(no option)
--pause-on-exit=false
- pause when scrcpy returns with an error (a non-zero exit code):
--pause-on-exit=if-error
This is useful to prevent the terminal window from automatically
closing, so that error messages can be read.
Refs #3817 <https://github.com/Genymobile/scrcpy/pull/3817>
Refs #3822 <https://github.com/Genymobile/scrcpy/pull/3822>
PR #4130 <https://github.com/Genymobile/scrcpy/pull/4130>