* Add Github Actions Workflow
Remove phan
Set phpstan to v1
cleanup gitignore

* Add ftp extension for windows

… (#75)

* Invalidate opcache before deleting file

Invalidate the OPCache for the file before actually deleting it. See  https://www.php.net/manual/en/function.opcache-invalidate.php#116372

* Invalidate opcache of source before moving file

* Invalidate opcache of temp file

Invalidate opcache of uploaded temp file before saving to target file

* Better check if opcache_invalidate is possible

Check if
- opcache is enabled, and
- the opcache_invalidate function is available, and
- calling opcache_invalidate is not restricted by opcache.restrict_api or it is restricted to allow the currently executing script
and save the result in a static variable.

* Remaining code style fix