Disable Xdebug - travis does not support php 8.0 (#193)

If tests don't work with Xdebug, that's an issue with Xdebug.
(in php 8.1.0-dev, it's broken, which is normal due to rapid changes)

Add a .editorconfig for this project (#162)

* [skip ci] Add a .editorconfig for this project

Add default indentation choice for file types where it currently isn't a mix.

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Add a .editorconfig for this project (#162)

* [skip ci] Add a .editorconfig for this project

Add default indentation choice for file types where it currently isn't a mix.

* [skip ci] Suggest spaces for phpt tests

The majority of files use spaces

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