Add IRenderer and adjust DrawNode signature

[smoogipoo]

For a view of the full changes: smoogipoo#88

• Adds the IRenderer interface.
• Adds IRenderer to the DrawNode method signatures.
• Moves default quad batch stuff to GLWrapper for now. This isn't the final location, but is needed for the time being due to the way TextureGLSingle works.
• Re-namespaces ClearInfo/MaskingInfo/DepthInfo drawing structs.

vNext

IRenderer added as parameter to DrawNode

- DrawNode.Draw(Action<TexturedVertex2D> vertexAction);
+ DrawNode.Draw(IRenderer renderer);
- DrawNode.DrawOpaqueInterior(Action<TexturedVertex2D> vertexAction);
+ DrawNode.DrawOpaqueInterior(IRenderer renderer);

In places where the vertexAction parameter was used, pass null instead.

ClearInfo, MaskingInfo, DepthInfo have been re-namespaced

The new namespace is osu.Framework.Graphics.Rendering.

[peppy]

No issues with the code changes in this PR, but:

In places where the vertexAction parameter was used, pass null instead

Do you have an example of a case like this? I couldn't find any in the diff, and I'm not sure what the null is. Is it implying a null IRenderer is provided in some edge case? At first I thought this wouldn't even be valid but then noticed nullability isn't turned on (might be something to do as part of this pass?)

[smoogipoo]

The vertexAction parameter doesn’t exist anymore, replaced by internal handling (see the PushQuadBatch/PopQuadBatch). It’s the same thing just that the consumer doesn’t have access to that quad batch anymore.
The DrawQuad vertexAction parameter is already default-null, so you can either provide null or remove the parameter altogether.

Examples of this are in the osu!-side PR, where I’ve removed the parameter.

[peppy]

Hmm, even looking at the osu! side changes I can't see where this advice would apply. Can you link an example line?

[smoogipoo]

https://github.com/ppy/osu/pull/19461/files#diff-029bbf29cd3db400bca8db562da31f5f7c289ce2fde9fe9033a90234131fb76dR115-R117 (ParticleExplosion.cs)