Refactor pipeline state and render output abstractions

- Replace old pipeline enums/structs with new strongly-typed PipelineState and enums (ZTest, ZWrite, Cull, Blend, ColorWriteMask)
- Redesign pipeline keying: introduce 128-bit GraphicsPipelineKey, MaterialPipelineKey, and PassPipelineKey for robust PSO caching
- Replace IRenderTargetStrategy with IRenderOutput; add SwapChainRenderOutput and TextureRenderOutput
- Update renderer and window code to use new render output abstraction and handle viewport/scissor updates
- Make ShaderPass a readonly struct and Shader a struct; use ID-based pass lookup for efficiency
- Materials now support per-pass pipeline overrides with new keying
- Add defensive checks in D3D12CommandBuffer; update D3D12PipelineLibrary for new keying/state
- Move test shader to test.gsdef and update for new pipeline state syntax
- Remove obsolete files/interfaces and perform general code cleanups
- Update all usages and parsing logic for new pipeline state system

Ghost.Shader/Compiler/SDLSemantics.cs

@@ -18,11 +18,11 @@ internal class PropertySemantic
 
 internal class PipelineSemantic
 {
-    public ZTestOptions? zTest;
-    public ZWriteOptions? zWrite;
-    public CullOptions? cull;
-    public BlendOptions? blend;
-    public uint? colorMask;
+    public ZTest? zTest;
+    public ZWrite? zWrite;
+    public Cull? cull;
+    public Blend? blend;
+    public ColorWriteMask? colorMask;
 }
 
 internal class PassSemantic