[BUGFIX] Add UnionTypes for method arguments #676
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Currently the extension builder fails to save an extension, if a methods argument type is a union type.
After merging this patch, Union Types are allowed. For simple types like null, int, float, bool, string, array, callable, object and mixed no backslash will be prefixed to the type.
This needs to be tested, if I miss any simple types in the list. Otherwise a backslash will be prefixed unnecessary and the PHP-Code will likely fail.