* Restored FFI to working order
* Disabled incompatible tests, fixed string conversion
* Use extension_loaded instead of checking PHP version
* Added better checks for FFI
* Do not build FFI deps if no FFI is present
* Updates to stub generation
* More idiomatic fixes from PHP team
* Moved tests from src/tests -> tests, got rid of extension-only tests
* fixed up test paths, regenerated arginfo