feat: add Zaparoo native video core

[asturur]

Summary

• add a 320x240 RGBX8888 native video DDR reader
• add native 15.734 kHz timing and top-level wrapper
• wire Menu_MiSTer to drive VGA from the native path and stop clearing DDR

Validation

• git diff --check
• local Quartus Docker compile could not run because Docker storage was full while pulling the Quartus image

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