Update php versions tested in CI, prepare the 1.0.15 release (#218)

* Update php versions tested in CI

PHP '8.1' isn't published yet on docker hub.

Start testing with php 8

Update php versions tested in CI, prepare the 1.0.15 release (#218)

* Update php versions tested in CI

PHP '8.1' isn't published yet on docker hub.

Start testing with php 8.1 in appveyor

* Prepare for a 1.0.15 release

Make it possible to test with php 8.2 without deprecation notes for
endLineno, etc. See #217

Also, document how to properly update cache slot numbers if new
properties are added to ast\Node in the future.

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Start testing with github actions (#202)

The script `ci/test_dockerized.sh 8.0` can be used to run the exact same
tests locally.

Closes #198

Change the comment text to

Start testing with github actions (#202)

The script `ci/test_dockerized.sh 8.0` can be used to run the exact same
tests locally.

Closes #198

Change the comment text to avoid -Wimplicit-fallthrough to avoid noise
https://developers.redhat.com/blog/2017/03/10/wimplicit-fallthrough-in-gcc-7/

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