Fast CRT TV shader

Current features:

• 🖱️ Custom UI: Toggle features on and off and tweak parameters to your liking. If you make a mistake, you can reset any parameter to the default value.
• 🧅 Multiple optional passes: Pick and choose out of seven features to enable: interpolation, scanlines, curvature, gamma correction, noise, glare, border
• ✨ Bloat-free: All features are optional. Compile-time toggles ensure that features don't consume any GPU resources when disabled.
• 📱 Aspect ratio helper: The included camera script can resize the viewport to fit the emulated CRT TV's aspect ratio, regardless of the target device resolution (PC, smartphone, VR)
• 🎞️ Textures, not math: Uses lookup textures instead of math to take advantage of native interpolation.
• 👾 Looks good at any resolution: Performs moiré pattern reduction. Fades out the CRT effect at low resolutions to reduce noise.
• 🎨 Dynamic color correction: Boosts the underlying pixels where needed, in order to compensate for any darkening or distortion from the CRT effect. This causes a slight color shift.
• 📹 Not just for postprocessing: The camera script also supports render textures, allowing you to render camera feeds to textures in your game. Perfect for CCTV surveillance rooms.

Planned features (~Q4 2025):

• 📐 Support for non-square pixel aspect ratios: For accurate SNES and C64 style pixel art.
• 📺 Composite video artifacts: Simulates older TVs without analog filters.

Out of scope features:

• ❌ VHS filters: Would add too much bloat.