If a class name is passed as a concrete, check that the class
constructor is public if it exists. If another type of concrete is
passed, check that it's valid (a callback or an object).
Also update the autoloader to check if the class file exists,
otherwise class_exists fails if a namespaced class doesn't exist.
The following methods are added and can be invoked using `WC()`,
they just redirect to the same methods in LegacyProxy:
call_function
call_static
get_instance_of
- Method and class renames.
- Removed unnecessary autoloader registration.
- Add a unit test for classes with non-object type hints
in constructor arguments.
- `get_instance_of` accepts now arguments to be passed to the
class constructor if necessary.
- `get_special_instance_of` method removed, instead, now if a method
named `get_instance_of_<lowercased class name>` exists in the class,
it is used to get the instance of the class.
- A couple more unit tests added.
Also:
- Make the methods in `AbstractServiceProvider` protected.
- Add an autoloader for files in the `tests/php/src` directory.
- Fix a bug in the provisional (?) autoloader.