Glid ought to be able to adopt and release its objects.

[NicolBolas]

GLid should be able to be constructed with GLuints that it did not create. This way, people can use arbitrary means to create, for example, texture objects, then pass them along to the GLDR texture class.

Similarly, GLid should be able to release its current object. This allows the user to abandon the current object. This would be useful if the user allowed the C++ object to outlive the OpenGL context, or more likely, to just be able to transfer ownership to themselves, allowing the resource to outlive the C++ object.