Add a 3D tonemapping and color correction demo

This showcases various tonemapping operators and their interaction
with several color correction textures (1D and 3D).

A script generating neutral 3D LUT textures is also included.

3d/tonemap_color_correction/README.md

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+# Tonemapping and Color Correction
+
+This showcases various tonemapping operators and their interaction with several
+color correction textures (1D and 3D).
+
+A script generating neutral 3D LUT textures is also included.
+
+Language: GDScript
+
+Renderer: Forward Plus
+
+## Screenshots
+
+![Screenshot](screenshots/tonemap_color_correction.webp)

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