[Feat] (MG_State/RenderState, MG_Backend/DirectVulkan): make Distant

Horizon work
- Implement BlendEquation/CullFaceMode/PointSize/PolygonMode
- Implement GetFramebufferAttachmentParameter*
- Downgrade some color attachment resolve failure
- Downgrade some overly-strict shader stage linkage check (don't check
  on unused input var)

MobileGL/MG_Impl/GLImpl/Buffer/GL_Buffer.cpp

@@ -502,7 +502,7 @@ namespace MobileGL::MG_Impl::GLImpl {
     }
 
     GLboolean IsBuffer_State(GLuint buffer) {
-        if (!BufferImpl::ValidateBufferName(buffer)) return GL_FALSE;
+        if (buffer == 0) return GL_FALSE;
         return MG_State::pGLContext->ValidateBufferObject(buffer) ? GL_TRUE : GL_FALSE;
     }