Updated release history and readme; updated submodules

Author: TheMostDiligent

DiligentCore

@@ -754,8 +754,10 @@ This project has some third-party dependencies, each of which may have independe
 
 To contribute your code, submit a [Pull Request](https://github.com/DiligentGraphics/DiligentEngine/pulls) 
 to this repository. **Diligent Engine** is licensed under the [Apache 2.0 license](License.txt) that guarantees 
-that code in the **DiligentEngine** repository is free of Intellectual Property encumbrances. In submitting code to
-this repository, you are agreeing that the code is free of any Intellectual Property claims.  
+that content in the **DiligentEngine** repository is free of Intellectual Property encumbrances.
+In submitting any content to this repository,
+[you license that content under the same terms](https://docs.github.com/en/free-pro-team@latest/github/site-policy/github-terms-of-service#6-contributions-under-repository-license),
+and you agree that the content is free of any Intellectual Property claims and you have the right to license it under those terms. 
 
 Diligent Engine uses [clang-format](https://clang.llvm.org/docs/ClangFormat.html) to ensure
 consistent source code style throught the code base. The format is validated by appveyor and travis

DiligentFX

@@ -1,4 +1,74 @@
 
+## v2.4.g
+
+### API Changes
+
+* Enabled ray tracing (API Version 240080)
+* Added `IDeviceContext::GetFrameNumber` method (API Version 240079)
+* Added `ShaderResourceQueries` device feature and `EngineGLCreateInfo::ForceNonSeparablePrograms` parameter (API Version 240078)
+
+* Renamed `USAGE_STATIC` to `USAGE_IMMUTABLE` (API Version 240077)
+
+* Renamed static samplers into immutable samplers (API Version 240076)
+  * Renamed `StaticSamplerDesc` -> `ImmutableSamplerDesc`
+  * Renamed `PipelineResourceLayoutDesc::NumStaticSamplers` -> `PipelineResourceLayoutDesc::NumImmutableSamplers`
+  * Renamed `PipelineResourceLayoutDesc::StaticSamplers` -> `PipelineResourceLayoutDesc::ImmutableSamplers`
+
+* Refactored pipeline state creation (API Version 240075)
+  * Replaced `PipelineStateCreateInfo` with `GraphicsPipelineStateCreateInfo` and `ComputePipelineStateCreateInfo`
+  * Replaced `IRenderDevice::CreatePipelineState` with `IRenderDevice::CreateGraphicsPipelineState` and `IRenderDevice::CreateComputePipelineState`
+  * `pVS`, `pGS`, `pHS`, `pDS`, `pPS`, `pAS`, `pMS` were moved from `GraphicsPipelineDesc` to `GraphicsPipelineStateCreateInfo`
+  * `GraphicsPipelineDesc GraphicsPipeline`  was moved from `PipelineStateDesc` to `GraphicsPipelineStateCreateInfo`
+  * `pCS` is now a member of `ComputePipelineStateCreateInfo`, `ComputePipelineDesc` was removed
+  * Added `IPipelineState::GetGraphicsPipelineDesc` method
+  
+  Old API for graphics pipeline initialization:
+  ```cpp
+  PipelineStateCreateInfo PSOCreateInfo;
+  PipelineStateDesc&      PSODesc = PSOCreateInfo.PSODesc;
+
+  PSODesc.GraphicsPipeline.pVS = pVS;
+  PSODesc.GraphicsPipeline.pPS = pVS;
+  // ...
+  Device->CreatePipelineState(PSOCreateInfo, &pPSO);
+  ```
+
+  New API for graphics pipeline initialization:
+  ```cpp
+  GraphicsPipelineStateCreateInfo PSOCreateInfo;
+  // ...
+  PSOCreateInfo.pVS = pVS;
+  PSOCreateInfo.pPS = pVS;
+  Device->CreateGraphicsPipelineState(PSOCreateInfo, &pPSO);
+  ```
+
+  Old API for compute pipeline initialization:
+  ```cpp
+  PipelineStateCreateInfo PSOCreateInfo;
+  PipelineStateDesc&      PSODesc = PSOCreateInfo.PSODesc;
+
+  PSODesc.ComputePipeline.pCS = pCS;
+  // ...
+  Device->CreatePipelineState(PSOCreateInfo, &pPSO);
+  ```
+
+    New API for compute pipeline initialization:
+  ```cpp
+  ComputePipelineStateCreateInfo PSOCreateInfo;
+
+  PSOCreateInfo.pCS = pCS;
+  Device->CreateComputePipelineState(PSOCreateInfo, &pPSO);
+  ```
+
+* Added `ShaderInt8`, `ResourceBuffer8BitAccess`, and `UniformBuffer8BitAccess` device features. (API Version 240074)
+* Added `ShaderFloat16`, `ResourceBuffer16BitAccess`, `UniformBuffer16BitAccess`, and `ShaderInputOutput16` device features. (API Version 240073)
+
+
+### Samples and Tutorials
+
+* Added [Tutorial21 - Ray Tracing](https://github.com/DiligentGraphics/DiligentSamples/tree/master/Tutorials/Tutorial21_RayTracing)
+
+
 ## v2.4.f
 
 ### API Changes
@@ -37,6 +107,7 @@
 * Added [Tutorial19 - Render Passes](https://github.com/DiligentGraphics/DiligentSamples/tree/master/Tutorials/Tutorial19_RenderPasses)
 * Added [Tutorial20 - Mesh Shader](https://github.com/DiligentGraphics/DiligentSamples/tree/master/Tutorials/Tutorial20_MeshShader)
 
+
 ## v2.4.e
 
 ### General