Parameter methods are probably unsound

[nox]

Method Gl::get_tex_parameter_iv when passed GL_TEXTURE_BORDER_COLOR will try to write four integer values in a &mut GLint which is obviously not large enough.

The same thing can happen with Gl::get_tex_parameter_fv.

For now, it can't happen with Gl::get_framebuffer_attachment_parameter_iv and Gl::get_renderbuffer_parameter_iv because all framebuffer attachment and renderbuffer parameters are single-valued, but nothing guarantees us that this will be true of all GL extensions in the future, so I would make it unsafe too.

Cc @kvark with whom I had debated about that in the past when it was a problem in gleam.

[nox]

Other methods that may need to be unsafe include Gl::get_query_iv, Gl::get_query_object_iv, Gl::get_query_object_uiv, Gl::get_query_object_i64v and Gl::get_query_object_ui64v.

[nox]

This is also an issue for the following sample parameter methods:

• Gl::get_sampler_parameter_iv
• Gl::get_sampler_parameter_fv
• Gl::sampler_parameter_iv
• Gl::sampler_parameter_fv

[nox]

There are at least three extensions that can help here, ANGLE_robust_client_memory, EXT_robustness and ARB_robustness.