Remove denoise module and thirdparty OIDN

This is replaced by a much lighter weight and faster JNLM denoiser. OIDN is still much more accurate, and may be provided as an optional backend in the future, but the JNLM denoiser seems good enough for most use cases and remove OIDN reduces the buildsystem complexity, binary size, and build times for Godot very significantly.
akien-mga · Sep 18, 2023 · 9412222 · 9412222
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diff --git a/COPYRIGHT.txt b/COPYRIGHT.txt
@@ -408,11 +408,6 @@ Comment: Stripped down version of "nvapi.h" from the NVIDIA NVAPI SDK
 Copyright: 2019-2022, NVIDIA Corporation
 License: Expat
 
-Files: ./thirdparty/oidn/
-Comment: Intel Open Image Denoise
-Copyright: 2009-2019, Intel Corporation
-License: Apache-2.0
-
 Files: ./thirdparty/openxr/
 Comment: OpenXR Loader
 Copyright: 2020-2023, The Khronos Group Inc.

diff --git a/doc/classes/LightmapGI.xml b/doc/classes/LightmapGI.xml
@@ -60,7 +60,6 @@
 		</member>
 		<member name="use_denoiser" type="bool" setter="set_use_denoiser" getter="is_using_denoiser" default="true">
 			If [code]true[/code], uses a CPU-based denoising algorithm on the generated lightmap. This eliminates most noise within the generated lightmap at the cost of longer bake times. File sizes are generally not impacted significantly by the use of a denoiser, although lossless compression may do a better job at compressing a denoised image.
-			[b]Note:[/b] The built-in denoiser (OpenImageDenoise) may crash when denoising lightmaps in large scenes. If you encounter a crash at the end of lightmap baking, try disabling [member use_denoiser].
 		</member>
 	</members>
 	<constants>

diff --git a/modules/denoise/SCsub b/modules/denoise/SCsub
diff --git a/modules/denoise/config.py b/modules/denoise/config.py
diff --git a/modules/denoise/denoise_wrapper.cpp b/modules/denoise/denoise_wrapper.cpp
diff --git a/modules/denoise/denoise_wrapper.h b/modules/denoise/denoise_wrapper.h
diff --git a/modules/denoise/lightmap_denoiser.cpp b/modules/denoise/lightmap_denoiser.cpp