Roan Mason

#9417 Adds palette and color scheme uniforms to custom shaders, allowing custom shaders to access terminal color information: - iPalette[256]: Full 256-color terminal palette (RGB) - iBackgroundColor, iForegroundColor: Terminal colors...

custom shader: added cursor style and visibility uniforms

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Fixes: #9416 Specifically: iCurrentCursorStyle iPreviousCursorStyle iCurrentCursorVisible iPreviousCursorVisible Visibility calculated and updated independently from the typical cursor uniform updates to preserve cursor style even when not in the viewport or set...